Posterior Muscles

vuluzico's version from 2015-11-02 02:55

Section 1

Question Answer
trapezius (origin)occipital bone, ligamentum nuchae, and spinous processes of c7-t12
trapezius (insertion)spine and acromion of scapula, lateral 1/3 of clavicle
trapezius (action)stabilizes, elevates, retracts, depresses and rotates scapula forward
trapezius (innervation)accessory nerve (CN XI) and spinal nerves c3-c4
levator scapulae (origin)transverse processes of c1-c4
levator scapulae (insertion)superior vertebral border of scapula
levator scapulae (innervation)spinal nerves c3-c5
rhomboideus major (origin) spinous processes of t2-t5
rhomboideus major (insertion) medial border of scaupla from spine to inferior angle
rhomboideus major (action)adducts scapula and performs downward rotation of scapula
rhomboideus major (innervation)spinal nerve C5
rhomboideus minor (origin)spinous processes of c7-t1
rhomboideus minor (insertion)medial border of scapula, superior to rhomboideus major
rhomboideus minor (action)adducts scapula and performs downard rotation of scapula
rhomboideus minor (innervation)spinal nerve C5

Section 2

Question Answer
splenius capitis (innervation)cervical spinal nerves
erector spinaeprime mover of back extension

Section 3

Question Answer
teres major (origin)inferior angle of scapula
teres major (insertion)intertubercular groove of humerus
teres major (action)extension, medial rotation, and adduction of arm
teres major (innervation)subscapular nerve
latissimus dorsi (O)spines of t7-t12, l1-l5, ribs 8-12, ilic crest, and thoracolumbar fascia
latissimus dorsi (I)intertubercular groove of humerus
latissimus dorsi (A)prime arm extensor; adduction and medial rotation at the shoulder; depresses shoulder
latissimus dorsi (N)thoracodorsal nerve (C6-C8)

Section 4

Question Answer
supraspinatus (O)supraspinaous fossa of scapula
supraspinatus (I)greater tubercle of humerus
supraspinatus (A)stabilizes shoulder joint, abducts arm
supraspinatus (N)suprascapular nerve
infraspinatus (O)infraspinous fossa of scapula
infraspinatus (I)greater tubercle of humerus
infraspinatus (A)spabilizes shoulder joint; laterally rotates arm
infraspinatus (N)suprascapular nerve
subscapularis (O)subscapular fossa of scapula
subscapularis (I)lesser tubercle of humerus
subscapularis (A)prime medial rotator of arm; stabilizes shoulder joint
subscapularis (N) subscapular nerve
teres minor (O)lateral scapular border
teres minor (I)lesser tubercle of humerus
teres minor (A)stabilizes houlder joint; laterally rotates arm
teres minor (N)axillary nerve

Section 5

Question Answer
triceps bracchii (long- O)infraglenoid tubercle of scapula
triceps brachii (lateral- O)proximal end of lateral humeral margin
triceps brachii (medial- O)distal to radial groove on posterior humeral shaft
triceps brachii (I)olecranon process of ulna
triceps brachii (A)prime extensor of forearm; extends arm
anconeus (O)lateral epicondyle of humerus
anconeus (I)lateral aspect of olecranon process of ulna
anconeus (A) abduction of ulna during forarm pronation; forearm extensor

Section 6

Question Answer
flexor carpi radialis (N)median nerve
palmaris longus (N)median nerve
flexor carpi ulnaris (N)ulnar nerve
flexor pollicis longus (N)median nerve
flexor digitorum superficialis (N)median nerve
flexor digitorum profundus (N)medial half- ulnar nerve; lateral half- median nerve

Section 7

Question Answer
gluteus maximus (O)dorsal ilium, sacrum, coccyx, and lumbodorsal fascia
gluteus maximus (I)gluteal tuberosity of femur and iliotibial tract
gluteus maximus (A) major thigh extensor; lateral rotation of thigh
gluteus maximus (N)inferior gluteal nerve
gluteus medius (O)anterior iliac crest of ilium between posterior and anterior gluteal lines
gluteus medius (I)greater trochanter of femur
gluteus medius (A)abduction and medial rotation of thigh, steadies pelvis
gluteus medius (N)superior gluteal nerve
gluteus minimus (O) lateral surface of ilium between inferior and anterior gluteal lines
gluteus minimus (I)greater trocanter of femur
gluteus minimus (A) abduction and medial rotation of thigh; steadies pelvis
gluteus minimus (N)superior gluteal nerve

Section 8

Question Answer
piriformis (O)anterolateral surface of sacrum
piriformis (I)greater trochanter of femur
piriformis (A)abduction (when flexed) and lateral rotation of thigh
piriformis (N) spinal nerves L5-S1
superior gemellus (O)ischial spine
superior gemellus (I)medial surface of greater trochanter of femur
superior gemellus (A)lateral rotation of thigh; abduction (when flexed)
superior gemellus (N)spinal nerves L5-S1
obturator internus (O)obturator membrane and obturator foramen
obturator internus (I)greater trochanter of femur
obturator internus (A) lateral rotation of thigh
obturator internus (N)spinal nerves L5-S1
inferior gemellus (O)ischial tuberosity
inferior gemellus (I)medial surface of greater tochanter of femur
inferior gemellus (A)lateral rotation of thigh; abduction (when flexed)
inferior gemellus (N)spinal nerves L5-S1
quadratus femoris (O)ischial tuberosity
quadratus femoris (I)intertrochanteric crest of femur
quadratus femoris (A)lateral rotation of thigh
quadratus femoris (N)spinal nerves L5-S1

Section 9

Question Answer
biceps femoris (long- O)ischial tuberosity
biceps femoris (short- O)linea aspera and distal femur
biceps femoris (I)head of fibula and lateral condyle of tibia
biceps femoris (A)extension of thigh; flexion and lateral rotation of leg
semitendinosus (O)ischial tuberosity
semitendinosus (I)medial aspect of proximal tibial shaft
semitendinosus (A)extension of thigh; flexion and medial rotation of leg
semimembranosus (O)ischial tuberosity
semimembranosus (I)medial condyle of the tibia
semimembranosus (A)extension of thigh; flexion and medial rotation of leg