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IMI Posterior O/I/A

Posterior O/I/A Review

QuestionAnswer
ORIGIN: Infraspinous fossa of scapula. INSERTION: Greater tubercle of humerus. Infraspinatus
ACTION: Laterally rotates the shoulder. Adducts the shoulder. Extends the shoulder. Horizontally abducts the shoulder. Stabilizes head of humorous in glenoid cavity. Infraspinatus
ORIGIN: Supraspinatus fossa of scapula. INSERTION: Greater tubercle of humerus. Supraspinatus
ACTION: Abducts shoulder. Stabilizes head of humerus. Supraspinatus
ORIGIN: Spinous process of T-2 to T-5. INSERTION: Medial border of scapula between spine. of the scapula and inferior angle. Rhomboid Major
ACTION: Adducts the scapula. Elevates the scapula. Downwardly rotates the scapula. Rhomboid Major
ORIGIN: External occipital protuberance, medial portion of superior nuchal line of occiput, ligamentum nuchae, and spinous processes of C-7 through T-12. INSERTION: Lateral one-third of clavicle, acromion, and spine of the scapula. Trapezius
ACTION: Upper Fibers/Bi-Extends head & neck. Upper Fibers/Uni-Laterally flex head & neck to same side. Rotate head & neck to opposite side. Elevate & upwardly rotate scapula. Middle Fibers: Adduct scapula Stabilize scapula. Lower Fibers: Depres Trapezius
ORIGIN: Later side of inferior angle and lower half of lateral border of scapula. INSERTION: Crest of the lesser tubercle of the humerus. Teres Major
ACTION: Extends shoulder. Adducts the shoulder. Medially rotates the shoulder. Teres Major
ORIGIN: Posterior iliac crest, iliolumbar ligament. INSERTION: Last rib, transverse processes of the first through fourth lumbar vertebrae. Quadratus Lumborum
ACTION: Unilaterally-Elevates hip. Laterally-Flexes the vertebral column. Assist to extend the vertebral column. Bilaterally: Fixes the last rib during respiration. Quadratus Lumborum
ORIGIN: Coccyx, posterior sacrum, posterior iliac crest, sacrotuberous and sacroiliac ligaments. INSERTION: Gluteal tuberosity (upper fibers) and iliotibial tract (lower fibers). Gluteus Maximus
ACTION: Extends the hip. Laterally rotates the hip. Abducts the hip. Lower fibers adduct the hip. Gluteus Maximus
ORIGIN: Anterior surface of sacrum. INSERTION: Greater trochanter. Piriformis
ACTION: Laterally rotates the hip. Abducts the thigh when the hip is flexed. Piriformis
ORIGIN: External surface the ilium between iliac crest and posterior and anterior gluteal lines. INSERTION: Greater trochanter. Gluteus Medius
ACTION: Abducts the hip. Flexes the hip. Extends the hip. May medially rotate and laterally rotate the hip. Gluteus Medius
ORIGIN: Iliac crest, posterior to the ASIS. INSERTION: Iliotibial tract. Tensor Fascia Latae
ACTION: Flexes the hip. Medially rotates the hip. Abducts the hip. Tensor Fascia Latae
ORIGIN: Lateral lip of linea aspera, gluteal tuberosity. INSERTION: Tibial Tuberosity. Vastus Lateralis
ACTION: Extend the Knee. Vastus Lateralis
ORIGIN: Long Head: Infraglenoid tubercle of scapula. Lateral Head: Posterior surface of proximal half of humerus. Medial Head: Posterior surface of distal half of humerus. INSERTION: Olecranon process of ulna. Triceps Brachii
ACTION: All Heads: Extend the elbow. Long Head: Extends the shoulder. Adducts the shoulder. Triceps Brachii
ORIGIN: Ischial tuberosity. INSERTION: Proximal, medial shaft of the tibia at pes anserinus tendon. Semitendinosis
ACTION: Flex the knee. Extend the hip. Tilt the pelvis posteriorly. Medially rotates the hip. Medially rotates the flexed knee. Semitendinosis
ORIGIN: Ischial tuberosity. INSERTION: Posterior aspect of medial condyle of tibia. Semimembranosus
ACTION: Flex the knee. Extend the hip. Tilt the pelvis posteriorly. Medially rotates the hip. Medially rotates the flexed knee. Semimembranosus
ORIGIN: Proximal two-thirds of lateral fibula. INSERTION: Base of the first metatarsal, medial cuneiform. Peroneus Longus
ACTION: Everts the foot. Assist in plantar flexion of the ankle. Peroneus Longus
ORIGIN: Posterior condyles of the femur. INSERTION: Calcaneus via calcaneal tendon. Gastrocnemius
ACTION: Flexes the knee. Planter flexes the ankle. Gastrocnemius
ORIGIN: Transverse processes of first through fourth cervical vertebrae. INSERTION: Medial border and superior angle of scapula. Levator Scapula
ACTION: Unilaterally - Elevates the scapula., Downwardly rotates the scapula. Laterally flexes head and neck., Rotates head and neck to the same side. Bilaterally - Extends the head and neck. Levator Scapula
ORIGIN: Surfaces of upper eight or nine ribs. INSERTION: Anterior surface of medial border of scapula. Anterior Serratus
ACTION: Abducts the scapula. Depresses the scapula. Holds the medial border of scapula against the rib cage. Anterior Serratus
ORIGIN: Spinous processes of last six thoracic vertebrae, last three or four ribs, thoracolumbar aponeurosis, and posterior iliac crest. INSERTION: Crest of the lesser tubercle of the humerus. Latissimus Dorsi
ACTION: Extends the shoulder. Adducts the shoulder. Medially rotates the shoulder. Latissimus Dorsi
ORIGIN: (Long head)Ischial tuberosity and (short head) lateral lip of linea aspera. INSERTION: Head of the fibula. Biceps Femoris
ACTION: Flexes the knee (all). Extend the hip (all). Tilt pelvis posteriorly (all). Laterally rotates the hip. Laterally rotates the flexed knee Biceps Femoris
Created by: KLCD
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