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Musculature

OIAN

QuestionAnswer
Coracobrachialis Origin Coracoid process of scapula
Coracobrachialis Insertion Medial surface of mid-humerus
Coracobrachialis Action Flex humerus Adduct humerus
Coracobrachialis Nervation Musculocutaneous
Pronator Teres Origin Common flexor tendon from the medial epicondyle of the humerus
Pronator Teres Insertion Middle of the lateral surface of radius
Pronator Teres Action Pronate forearm (*assist to flex elbow)
Pronator Teres Nervation Median
Brachialis Origin Distal half of anterior humerus
Brachialis Insertion Tuberosity and coranoid process of ulna
Brachialis Action Flex elbow
Brachialis Nervation Musculocutaneous-small branch from radius
Brachioradialis Origin Proximal 2/3 of lateral supracondylar ridge of humerus
Brachioradialis Insertion Radial styloid
Brachioradialis Action Flex elbow (Assist with pro/sup)
Brachioradialis Nervation Radial
Anconeus Origin Lateral epicondyle of humerus
Anconeus Insertion Olecranon process and posterior proximal surface of ulna
Anconeus Action Extend elbow
Anconeus Nervation Radial
Teres Major Origin Inferior angle, Lower 1/3 of lateral border of scapula
Teres Major Insertion Crest of lesser tubercle of humerus
Teres Major Action Adduct shoulder Internally rotate shoulder Extend shoulder
Teres Major Nervation Lower subscapular
Subscapularis Origin Subscapular fossa of scapula
Subscapularis Insertion Lesser tubercle of humerus
Subscapularis Action Internally rotate shoulder Stabilize shoulder
Subscapularis Nervation Upper & lower subscapular
Infraspinatus Origin Infraspinatus fossa of scapula
Infraspinatus Insertion Greater tubercle of humerus
Infraspinatus Action External rotation of shoulder Adduction of shoulder
Infraspinatus Nervation Suprascapular
Supraspinatus Origin Supraspinatus fossa of scapula
Supraspinatus Insertion Greater tubercle of humerus
Supraspinatus Action Abduct shoulder Stabilize shoulder
Supraspinatus Nervation Suprascapular
Deltoid Origin Lateral 1/3 of clavicle, acromion, spine of scapula
Deltoid Insertion Deltoid tuberosity
Deltoid Action Anterior fibers: ABD, FLEX, IR, Horz. ADD shoulder Middle fibers: ABD shoulder Post fibers: ABD, EXT, ER, Horz. ABD shoulder
Deltoid Nervation Axillary
Teres Minor Origin Upper 2/3 of lateral border of scapula
Teres Minor Insertion Greater tubercle of humerus
Teres Minor Action Externally rotate shoulder Adduct shoulder Stabilize head of humerous in glenoid cavity
Teres Minor Nervation Axillary
Latissimus Dorsi Origin Inferior angle of scapula, spinous processes of T7-T12, ribs 9-12, thoracolumbar aponeurosis, posterior illac crest
Latissimus Dorsi Insertion Intertubicular groove of humerus (bicipital groove)
Latissimus Dorsi Action Extend shoulder Adduct shoulder Internally Rotate shoulder
Latissimus Dorsi Nervation Thoracodorsal
Pectoralis Major Origin Medial half of clavicle, sternum, ribs 1-6
Pectoralis Major Insertion Crest of greater tubercle of humerus
Pectoralis Major Action All fibers: ADD, IR shldr, assist to elevate thorax during forced inhalation with fixed arm Upper fibers: FLEX, Horz. ADD shldr Lower fibers: EXT shldr
Pectoralis Major Nervation Upper fibers: Lateral pectoral Lower fibers: Lateral & medial pectoral
Pronator Quadratus Origin Medial/anterior surface of distal ulna
Pronator Quadratus Insertion Lateral/anterior surface of distal radius
Pronator Quadratus Action Pronate the forearm
Pronator Quadratus Nervation Median
Supinator Origin Lateral epicondyle of humerus, radial collateral ligament
Supinator Insertion Anterior/lateral surface of proximal 1/3 of radial shaft
Supinator Action Supinate forearm
Supinator Nervation Radial
Triceps Brachii Origin Long head: infraglenoid tubercle of scapula Lateral head: posterior surface of proximal half of humerus Medial head: posterior surface of distal 1/2 of humerus
Triceps Brachii Insertion Olecranon process
Triceps Brachii Action All heads: extend elbow Long head: Extend elbow, extend shoulder, adduct shoulder
Triceps Brachii Nervation Radial
Biceps Brachii Origin Long head: Superaglenoid tubercle of scapula Short head: Coracoid process of scapula
Biceps Brachii Insertion Radial tuberosity, aponeurosis of biceps brachii
Bicep Brachii Action Flex elbow Flex shoulder Supinate forarm
Bicep Brachii Nervation Musculocutaneous
Extensor Carpi Radialis Longus Origin Distal 1/3 of lateral supracondylar ridge of humerus
Extensor Carpi Radialis Longus Insertion Base of second metacarpal
Extensor Carpi Radialis Longus Action Extend wrist radial deviate (assist to flex elbow)
Extensor Carpi Radialis Longus Nervation Radial
Extensor Carpi Radialis Brevis Origin Common extensor tendon from lateral epicondyle
Extensor Carpi Radialis Brevis Insertion Base of third metacarpal
Extensor Carpi Radialis Brevis Action Extend wrist radial deviate (assist to flex elbow)
Extensor Carpi Radialis Brevis Nervation Radial
Flexor Carpi Ulnaris Origin Humeral head: common extensor tendon from lateral epicondyle Ulnar head: posterior surface of proximal 2/3 of ulna
Flexor Carpi Ulnaris Insertion Pisiform hook of hamate, base of 5th metacarpal
Flexor Carpi Ulnaris Action Flex wrist ulnar deviate (assist to flex elbow)
Flexor Carpi Ulnaris Nervation Ulnar
Flexor Carpi Radialis Origin Common flexor tendon from medial epicondyle of humerus
Flexor Carpi Radialis Insertion Bases of 2nd & 3rd metacarpals
Flexor Carpi Radialis Action Flex, radial deviate wrist (assist to flex elbow)
Flexor Carpi Radialis Nervation Median
Palmaris Longus Origin Common flexor tendon from medial epicondyle
Palmaris Longus Insertion Flexor retinaculum & palmer aponeurosis
Palmaris Longus Action Tense palmar fascia Flex wrist (assist to flex elbow)
Palmaris Longus Nervation Median
Pectoralis Minor Origin Ribs 3-5
Pectoralis Minor Insertion Medial surface of coracoid process of scapula
Pectoralis Minor Action Depress scapula Abduct (protract) scapula Downwardly rotate scapula Assist in forced inhalation with fixed scapula
Pectoralis Minor Nervation Medial Pectoral
Serratus Anterior Origin External surfaces of upper 8-9 ribs
Serratus Anterior Insertion Anterior surfaces of medial border of scapula
Serratus Anterior Action Abduct (protract) scapula Depress scapula Upwardly rotate scapula prevent winging of scapula (may assist to elevate rib cage with forced inhalation with fixed scapula)
Serratus Anterior Nervation Long Thoracic
Trapezius Origin External occipital protuberance, Superior nuchal line of occiput, Ligamentum nuchae, Spinous processes of C7-T12
Trapezius Insertion Lateral 1/3 of clavicle, Acromion, Spine of scapula
Trapezius Action Upper fibers(unilat): Cerv lateral FLEX to same side Cerv rotate to opposite side Elevate/upwardly rotate scapula Upper fibers(bilat): Cerv EXT Middle Fibers: ADD (retract) scapula Stabilize scapula Lower Fibers: Depress/upwardly rotate scapula
Trapezius Nervation Accessory (cranial nerve XI), Ventral Ramus
Rhomboid Minor Origin Spinous processes C7-T1
Rhomboid Minor Insertion Upper portion of medial border of scapula-across from spine of scapula
Rhomboid Minor Action Adduct (retract) scapula Elevate scapula Downwardly rotate scapula
Rhomboid Minor Nervation Dorsal Scapular
Rhomboid Major Origin Spinous processes of T2-T5
Rhomboid Major Insertion Medial boarder of scapula between spine of scapula and inferior angle
Rhomboid Major Action Adduct (retract) scapula Elevate scapula Downwardly rotate scapula
Rhomboid Major Nervation Dorsal scapular
Levator Scapula Origin Transverse processes of C1-C4
Levator Scapula Insertion Medial border of scapula between superior angle and superior portion of spine of scapula
Levator Scapula Action Unilateral: Elevate scapula Downward rotate scapula Cervical lateral flexion Cervical rotation to same side Bilateral: Cervical extension
Levator Scapula Nervation Dorsal scapular Cranial nerves
Opponens Pollicis Action Opposition of thumb
Opponens Pollicis Nervation Median
Adductor Pollicis Action Adduct thumb (CMC and MCP joints; assist in thumb flexion (MCP joint)
Abductor Pollicis Brevis Action Abduct thumb (CMC and MCP joints); assist in thumb opposition
Abductor Pollicis Brevis Nervation Median
Flexor Pollicis Brevis Action Flex thumb (CMC and MCP joints); assist in thumb opposition
Abductor Pollicis Longus Action Abduct & extend thumb (CMC joint); radial deviate wrist
Abductor Pollicis Longus Origin Posterior surface of radius and ulna and interosseous membrane
Abductor Pollicis Longus Insertion Base of first metacarpal
Abductor Pollicis Longus Nervation Radial
Extensor Pollicis Longus Action Extend thumb & radial deviate wrist
Extensor Pollicis Longus Origin Posterior surface of ulna and interosseous membrane
Extensor Pollicis Brevis Action Extend thumb & radial deviate wrist
Extensor Pollicis Brevis Origin Posterior surface of radius & interosseous membrane
Extensor Pollicis Brevis Insertion Proximal phalange of thumb
Extensor Pollicis Brevis Nervation Radial
Flexor Pollicis Longus Action Flex thumb & assist to flex wrist
Flexor Pollicis Longus Origin Anterior surface of radius and interosseous membrane
Flexor Pollicis Longus Insertion Distal phalange of thumb
Flexor Pollicis Longus Nerviation Median
Abductor Digiti Minimi Action Abduct fifth finger (MCP joint); assist in fifth finger opposition
Abductor Digiti Minimi Nervation Ulnar
Flexor Digiti Minimi Brevis Action Flex the fifth finger (MCP joint); assist in fifth finger oppositoin
Flexor Digiti Minimi Brevis Nervation Ulnar
Opponens Digiti Minimi Action Opposition of fifth finger
Opponens Digiti Minimi Nervation Ulnar
Extensor Digiti Minimi Action Extends fifth finger
Extensor Digiti Minimi Nervation Radial
Lumbricals Action Extend PIP & DIP of fingers 2-5; Flex MCP of fingers 2-5
Lumbricals Nervation Median (fingers 2-3), Ulnar (fingers 4-5)
Palmar Interossei Action Adduct fingers towards 3rd finger; Assist in finger flexion (MCP joint); assist in finger extension (PIP & DIP joints via extensor aponeurosis)
Palmar Interossei Nervation Ulnar
Dorsal Interossei Action Abduct fingers (MCP joint); Assist in finger flexion (MCP joint); assist in finger extension (PIP & DIP joints via extensor aponeurosis)
Dorsal Interossei Nervation Ulnar
Splenius Capitis and Cervicis Action Unilateral: rotate head & neck to same side; laterally flex head & neck to same side. Bilateral: Extend head & neck
Splenius Capitis and Cervicis Origin Capitus: Inferior 1/2 of ligamentum nuchae/ spinus processes of C7-T4 Cervicis: Spinous process T3-T6
Splenius Capitis and Cervicis Insertion Capitus: Mastoid process and lateral portion of superior nuchal line Cervicis: Spinous processes C1-C3
Splenius Capitis and Cervicis Nervation Cervical nerves
Longus Capitis Action Unilateral: Rotate head & neck to same side; laterally flex head & neck to same side Bilateral: Flex head & neck
Longus Capitis Nervation C1,2,3,(4)
Longus Colli Action Unilateral: rotate head & neck to same side; laterally flex head & neck to same side Bilateral: flex head & neck
Longus Colli Nervation C2-6, (7)
Sternocleidomastoid Action Unilateral rotate head & neck to opposite side, laterally flex head & neck to same side Bilateral: flex neck, assist in inhalation
Sternocleidomastoid Origin Sternal head: Top of manubrium Clavicular head: medial 1/3 of clavicle
Sternocleidomastoid Insertion Mastoid process of temporal bone, lateral portion of superior nuchal line of occiput
Sternocleidomastoid Nervation C(1), 2, 3
Scalenes Action Unilateral: rotate head & neck to the opposite side, laterally flex head and neck to the same side Bilateral: elevate ribs during inhalation Bilateral anterior scalenes: flex head & neck
Scalenes Origin Anterior transverse processes of C3-C6 Middle transverse processes of C2-C7 Posterior transverse processes of C6-C7
Scalenes Insertion Anterior: rib 1 Middle: rib 1 Posterior: rib 1
Scalenes Nervation C(3), 4-8
Platysma Action Assist in mandible depression, tighten fascia of neck, draw down corners of mouth
Platysma Nervation Facial (Cranial Nerve VII)
Occipitofrontalis Action Raise eyebrows, wrinkle forehead
Occipitofrontalis Nervation Facial (Cranial Nerve VII)
Orbicularis Oculi Action Close eyes tightly
Orbicularis Oculi Nervation Facial (Cranial Nerve VII)
Orbicularis Oris Action Approximates and protrudes lips as in whistling
Obicularis Oris Nervation Facial (Cranial Nerve VII)
Zygomaticus Major Action Smile
Zygomaticus Major Nervation Facial (Cranial Nerve VII)
Masseter Action Elevate mandible (TMJ), may assist protract the mandible
Masseter Nervation Trigeminal (Cranial nerve V) mandibular division
Temporalis Action Elevate & retract mandible (TMJ)
Temporalis Nervation Trigeminal (Cranial Nerve V) mandibular divistion
Medial Pterygoid Action Unilateral: Laterally deviate mandible to opposite side Bilateral: elevate & protract mandible
Medial Pterygoid Nervation Trigeminal (Cranial Nerve V)
Lateral Pterygoid Action Unilateral: Laterally deviate mandible to opposite side Bilateral: protract mandible
Lateral Pterygoid Nervation Trigeminal (Cranial Nerve V)
Digastric Action If hyoid bone is fixed, depresses the mandible. If mandible is fixed, elevates the hyoid retracts the mandible (TMJ)
Digastric Nervation Anterior belly: Trigeminal (Cranial V) mandibular division Posterior belly: Facial Cranial Nerve VII)
Rectus Capitis Posterior Major Action Extend upper cervical, rotate head to same side
Rectus Capitis Posterior Major Nervation Suboccipital
Rectus Capitis Posterior Minor Action Extend upper cervical
Rectus Capitis Posterior Minor Nervation Suboccipial
Oblique Capitis Superior Action Extend upper cervical, laterally flex head to same side
Oblique Capitis Superior Nervation Suboccipial
Oblique Capitis Inferior Action Rotate head to same side
Oblique Capitis Inferior Nervation Suboccipital
Quadratus Lumborum Action Unilateral: lateral pelvic tilt, trunk lateral flexion, assist to extend trunk Bilateral: fix rib 12 during forced inhalation and exhalation
Quadratus Lumborum Origin Posterior iliac crest
Quadratus Lumborum Insertion Rib 12, transverse process of 1-4 lumbar vertebraw
Quadratus Lumborum Nervation Lumbar Plexus, T12, L1, 2, 3
Rectus Abdominis Action Flex trunk, posterior pelvic tilt
Rectus Abdominis Nervation T5-T12, Ventral Rami
Rectus Abdominis Origin Pubic crest, pubic symphysis
Rectus Abdominis Insertion Cartilage of ribs 5-7, xiphoid process
External Oblique Action Unilateral: trunk lateral flexion to the same side, trunk rotation to the opposite side Bilateral: flex trunk, compress abdominal contents
External Oblique Origin External surface of ribs 5-12
External Oblique Insertion Anterior iliac crest; abdominal aponeurosis to linea alba
External Oblique Nervation T5-T12
Internal Oblique Action Unilateral: trunk lateral flexion to the same side, trunk rotation to the same side Bilateral: flex trunk, compress abdominal contents
Internal Oblique Origin Lateral inguinal ligament, iliac crest, thoracolumbar fascia
Internal Oblique Insertion Internal surface of lower 3 ribs; abdominal aponeurosis to linea alba
Internal Oblique Nervation T7-T12, L1, iliohypogastric and ilioinguinal, ventral rami
Transverse Abdominis Action Compress abdominal
Transverse Abdominis Origin Lateral inguinal ligament, iliac crest, thoracolumbar fascia and internal surface of lower ribs
Transverse Abdominis Insertion Abdominal aponeurosis to linea alba
Transverse Abdominis Nervation T7-12, L1, iliohypogastric and ilioguinal, ventral divisions
Diaphragm Action Draw down central tendon of diaphragm; increase volume of thoracic cavity during inhalation
Diaphragm Origin Costal: inner surface of lower 6 ribs Lumbar: upper 2-3 lumbar vertebrae Sternal: inner part of xiphoid process
Diaphragm Insertion Central tendon
Diaphragm Nervation Phrenic
Intercostals Action External intercostals: assist with inhalation by drawing ribs superiorly, increasing the space of the thoracic cavity Internal intercostals: assist with exhalation by drawing the ribs inferiorly, decreasing the space in the thoracic cavity
Intercostals Origin Inferior border of the rib above
Intercostals Insertion Superior border of the rib below
Intercostals Nervation Thoracic
Serratus Posterior Superior Action Elevate ribs during inhalation
Serratus Posterior Superior Origin Spinous processes of C7-T3
Serratus Posterior Superior Insertion Posterior surface of ribs 2-5
Serratus Posterior Superior Nervation T1-T4
Serratus Posterior Inferior Action Depress ribs during exhalation
Serratus Posterior Inferior Origin Spinous processes of T12-L3
Serratus Posterior Inferior Insertion Posterior surface of ribs 9-12
Serratus Posterior Inferior Nervation T9-T12
Intertransversarii Action Unilateral: trunk lateral flexion to the same side Bilateral: extend trunk
Intertransversarii Origin Span: Transverse processes C2-C7 transverse processes L1-5
Intertransversarii Insertion Span: transverse processes of C2-C7 transverse processes of L1-5
Intertransversarii Nervation Spinal Nerves
Interspinalis Action Extend trunk
Interspinalis Origin Span: spinous process C2-T3 Spinous process T12-L5
Interspinalis Insertion Span: spinous process C2-T3 Spinous process T12-L5
Interspinalis Nervation Spinal nerves
Spinalis Action Unilateral: trunk lateral flexion to same side Bilateral: extend trunk
Spinalis Origin Spinous process of the upper lumbar and lower thoracic vertebrae; Ligamentum nuchae, spinous process of C7
Spinalis Insertion Spinous processes of upper thoracic and cervicals EXCEPT C1
Spinalis Nervation Spinal nerves
Longissimus Action A: Unilateral: trunk lateral flexion to same side Bilateral: extend trunk
Longissimus Origins Common tendon; transverse processes of upper 5 thoracic vertebrae
Longissimus Insertion Lower 9 ribs and transverse processes of thoracic verabrae; transverse processes of cervical vertebrae; mastoid process of temporal bone
Longissimus Nervation Spinal nerves
Iliocostalis Action Unilateral: trunk lateral flexion to same side Bilateral: extend trunk
Iliocostalis Origin Common tendon; posterior surface of ribs 1-12
Iliocostalis Insertion Transverse process of lumbar vertebrae 1-3 and posterior surface of ribs 1-12; transverse processes of lower cervicals
Iliocostalis Nervation Spinal Nerves
Multifidi Action Unilateral: rotate trunk to opposite side Bilateral: extend trunk
Multifidi Origin Sacrum and transverse processes of lumbar through cervical vertebrae
Multifidi Insertion Spinous processes of lumbar vertebrae through C2; span 2-4 vertebrae
Multifidi Nervation Spinal Nerves
Rotatores Action Unilateral: rotate trunk to opposite side Bilateral: extend trunk
Rotatores Origin Transverse processes of lumbar through cervical vertebrae
Rotatores Insertion Spinous processes of lumbar vertebrae through C2; span 1-2 vertebrae
Rotatores Nervation Spinal nerves
Semispinalis Capitis Action Extend head & trunk
Semispinalis Capitis Origin Transverse processes of C4-T5
Semispinalis Capitis Nervation Cervical Nerves
Semispinalis Capitis Insertion Between the superior and inferior nuchal lines of the occiput
Created by: Ahudak