Group 5

Question 1

Triceps brachii long head

Answer 1

O: Caudal border of scapula
I: Olecranon
F: Flexes shoulder, Extends elbow
N: Radial n.

Question 2

Triceps brachii lateral head

Answer 2

O: Deltoid tuberosity
I: Olecranon
F: Extends elbow
N: Radial n.

Question 3

Triceps brachii medial head

Answer 3

O: Medial surface of humerus (middle third)
I: Olecranon
F: Extends elbow
N: Radial n.

Question 4

Tensor fasciae antebrachii

Answer 4

O: Caudal border of scapula; insertion tendon of latissimus dorsi
I: Deep fascia of forearm; Olecranon
F: Tenses forearm fascia; Extends elbow
N: Radial n.

Question 5

Biceps brachii

Answer 5

O: Supraglenoid tubercle
I: Medial radial tuberosity: Medial collateral lig: via lacertus fibrosis on tendon of ext. carp. radialis
F: Extend shoulder, Flexes elbow, via LF stabilises carpus (part of stay apparatus)
N: Musculocutaneous n.

Question 6

Brachialis

Answer 6

O: Proximocaudal surface of humerus
I: Proximomedial surface of radius
F: Flexes elbow
N: Musculocutaneous n. (sometimes radial n.

Question 7

Subclavius

Answer 7

O: Sternum + Costal cartilages 1-4
I: Blends with supraspinatus and shoulder fascia
F: Suspends trunk; stabilises shoulder joint
N: Cranial pectoral n.

Question 8

Pectoralis descendens

Answer 8

O: Manubrium of sternum
I: Deltoid tuberosity, crest of humerus
F: Connect forelimb to trunk; Protracts + adducts limb
N: Cranial + Caudal pectoral nn.

Question 9

Pectoralis transversus

Answer 9

O: Costal cartilages 1=6 + Adjacent sternum
I: Forearm fascia
F: Connect forelimb to trunk; adduct limb
N: Cranial + Caudal pectoral nn.

Question 10

Pectoralis ascendens

Answer 10

O: Sternum; distally on ribs 4-9: Tunica flava abdominis
I: Greater + lesser tubercles of humerus; tendon of origin of coracobrachialis
F: Retracts + adducts forelimb; Suspends trunk between forelimbs; Stabilises shoulder joint
N: Cranial + Caudal pectoral nn.