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Trunk/up extremity

Trunk and upper extremities muscle groups

Biceps Brachii O-one head from the coracoid process; the other from the supraglenoid tubercle, I-tuberosity of radius, A-flexion at elbow and shoulder; supination
Deltoid O-clavicle and scapula, I-deltoid tuberosity of humerus, A-whole muscle: abduction at shoulder; anterior part: flexion and medial rotation; posterior part: extension and lateral rotation
Diaphragm O-xiphoid process, cartilages of ribs 4-10, and anterior surfaces of lumbar vertebrae, I-central tendinous sheet, A-contraction expands thoracic cavity, compresses abdominopelvic cavity
External Intercostals O-inferior border of each rib, I-superior boarder of more inferior rib, A-elvate ribs
External Oblique O-external and inferior borders of ribs 5-12, I-linea alba and iliac crest, A-compresses abdomen, depresses ribs, flexes or bends spine
Internal Oblique O-lumbodorsal fascia and iliac crest, I-inferior ribs, xiphoid process, and linea alba, A-compresses abdomen, depresses ribs, flexes or bends spine
Pectoralis Major O-cartilages of ribs 2-6, body of sternum, and inferior, dedial portion of clavicle, I-crest of greater tubercle and lateral lip of intertubercular groove of humerus; A-flexion, adduction, and medial rotation at shoulder
Pectoralis Minor O-anterior-superior surfaces of ribs 2-4, 2-5, or 3-5, depending on anatomical variation, I-coracoid process of scapula, A-depresses and protracts shoulder; rotates scapula so glenoid cavity moves inferorly; elevates ribs if scapula is stationary
Rectus Abdominis O-superior surface of pubis around symphysis, I-inferior surfaces of costal cartilages (ribs 5-7) and xiphoid process, A- depresses ribs, flexes vertebral column, compresses abdomen
Rhomboid Minor O-spinous processses of vertebrae C7-T1, I-vertebral border of scapula near spine, A-adducts scapula and performs downward rotation
Serratus Anterior O-anterior and superior margins of ribs 1-8 or 1-9, I-anterior surface of vertebral border of scapula, A-protracts shoulder; rotates scapula so glenoid cavity moves superiorly (upward rotation)
Transverse Abdominis O-cartilages of ribs 6-12, iliac crest, and lumbodorsal fascia, I-linea alba and pubis, A- compresses abdomen
Levator Scapulae origin-transverse processes of C1-C4, insertion-medial border of scapula superior to spine, action-elevates and adducts scapula
Trapezius origin-occipital bone and spinous processes of thoracic vertebrae, insertion-clavicle and scapula, action-elevate, retract, depress, or rotate scapula upward, elevate clavicle, or extend neck
Deltoid Origin-clavicle and scapula, Insertion: humerus, action-abduction at shoulder
Rhomboideus Major origin-spines of upper thoracic vertebrae, insertion: medial border of scapula, action-raises and adducts scapula
Supraspinatus origin-supraspinous fossa of scapula, insertion: greater tubercle of humerus, action-abduction at shoulder
Infraspinatus origin-infraspinous fossa of scapula, insertion-greater tubercle of humerus, action-lateral rotation at shoulder
Teres Minor origin-lateral border of scapula, insertion-greater tubercle of humerus, action-lateral rotation at shoulder
Teres Major origin-inferior angle of scapula, insertion-intertubercular groove of humerus, action-extension, adduction, and medial rotation at shoulder
Triceps Brachii origin-lateral margin of humerus and tubercle of scapula, insertion-olecranon of ulna, action-extension at elbow and extension and adduction at the shoulder
Latissimus Dorsi origin-spinous processes of inferior thoracic and all lumbar vertebrae, ribs 8-12, and lumbodorsal fascia, insertion-intertubercular groove of the humerus, action-extension, adduction, and medial rotation at shoulder
Extensor carpi radialis longus origin-lateral supracondylar ridge of humerus, insertion-base of second metacarpal bone, action-extension and abduction at wrist
Extensor digitorum origin-lateral epicondyle of humerus, insertion: digits 2-5, action-extends digits 2-5
Flexor carpi radialis Origin-medial epicondyle of humerus, Insertion-Bases of second and third metacarpal bones, Actions-Flexion and abduction at wrist
Palmaris longus origin-medial epicondyle of humerus, insertion-palmar aponeurosis, action-flexion at wrist
Flexor Carpi ulnaris Origin-Medial epicondyle of the humerus, Insertion-5th metacarpal, Action-Flexion and adduction at wrist
subscapularis origin-subscapular fossa of scapula, insertion-lesser tubercle of humerus, action-medial rotation at shoulder
Quadratus lumborum Origin-Iliolumbar ligament and iliac crest, Insertion-Inferior border of twelfth rib and transverse processes of L1-L4, Action-together they depress ribs, alone each side laterally flexes vertebral column
Splenius capitis Origin-Spinous processes of inferior cervical and superior thoracic vertebrae, Insertion-Mastoid process, occipital bone and transverse processes of superior cervical vertebrae, Action-Laterally flexes, rotates, and extends head and neck
Iliocostalis lumborum Origin-sacrum, iliac crest, Insertion-inferior surface of lower 7 rib, Action-extend spine, depress ribs
Scalenes Origin-transverse and costal processes of cervical vertebrae, Insertion-superior surfaces of first two ribs, Action-elevate ribs or flex neck
abductor digiti minimi abducts little finger
Flexor digiti minimi brevis flexes little finger
adductor pollicis adducts thumb
dorsal interossei abducts fingers
flexor pollicis brevis flexes thumb
lumbricals flex metacarpophalangeal joints, extend interphalangeal joints
opponens pollicis opposition of thumb
palmar interossei adduct fingers
Palmaris brevis moves skin on medial border toward midline of palm
bipennate muscle fascicles fascicle that's fibers converge on either of the sides like barbs of a feather.
sphicnter when the fascicles are arranged in concentric rings.
convergent muscle fascicles muscle fascicles where the origin of the fixed bone is wider than the point of insertion.
fascicle bundle of muscle fibers
multipennate muscle fascicles muscle with several central tendons go diagonally toward which the muscle fibers converge like the barbs of feathers.
parallel fascicles fascicles that run parallel to one another, and contraction of these muscle groups acts as an extension of the contraction of a single muscle fiber.
fusiform fascicles spindle-shaped muscles with parallel fibers
unipennate fascicles fascicles are arranged on only one side of tendon.
tendon attaches muscle to bone
ligament attaches bone to bone
pennate a type of muscle fiber arrangement in which each fiber attaches obliquely to a central tendon
Created by: droesener
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