Lab exam

Question 1

Triceps brachii insertion and origins

Answer 1

Long head - infraglenoid tubercle

Short (lateral) head - posterior surface of humerus (below radial sulcus)

Medical - same as lateral, but below the radial sulcus.

Insertion - olecranon process

Question 2

Biceps brachii insertion and origins

Answer 2

Long head - (tendon in the intertubercular sulcus) Supraglenoid tubercle

short head - coracoid process of the scapula

Insertion - radial tuberosity and bicipital aponeurosis

Question 3

Brachialis origin and insertion

Answer 3

Origin - anterior surface of humerus

insertion - coronoid process and the tuberosity of the ulna

Question 4

Flexor digitorum superficialis origin and insertion

Answer 4

Origin: Medial epicondyle of the humerus

Insertion: anterior margins on the bases of the middle phalanges

Question 5

Flexor digitorum profundus origin and insertion

Answer 5

origin - medial surface of the ulna, interosseous membrane, and deep fascia of the forearm.

insertion - base of the distal phalanges of the fingers

Question 6

flexor pollicis longus origin and insertion

Answer 6

Origin - volar surface of the radius

Insertion - base of the distal phalanx of the thumb

Question 7

Extensor pollicis longus and brevis origin and insertion

Answer 7

longus: posterior surface of ulna, distal phalanx of thumb.

Brevis: radius, proximal phalanx

Question 8

Where is the triangle of auscultation (between which three muscles)

Answer 8

on the back, teres maj., lat, rhomboid maj.

Question 9

where is the quadrilateral or quadrangular space (between which muscles)

Answer 9

on the back of the proximal humerus. teres minor, teres maj, long head of triceps (medial), humerus (lateral)

Question 10

there is some clear shit coming off of the conus medularis. what is it, what is it made of, and what does it do?

Answer 10

Internal terminal filum (filum terminale), made of pia mater, anchors the conus medularis to the inner aspect of the spinal dural sac.

Question 11

What anchors to the lesser and greater tubercules of the humerus?

Answer 11

lesser - subscapularis

greater - teres minor and the supra + infra spinatus

Question 12

Where is the deltopectoral triangle and what passes through it?

Answer 12

between the deltoid and pec maj, just under the clavicle.

cephalic vein passes through it. (comes off the axilary vein)

Question 13

What supplies teres major and subscapulus?

Answer 13

Lower subscapular nerve

upper subscapular nerve is only for the subscapularis

Question 14

What does the anterior interossius nerve innervate

Answer 14

Flexor pollicis longus, radial half of flexor digitorum profundus, pronator quadratus