Clinical Anatomy of the Upper Limb

Question 1

what joint in the should tis susceptible to dislocation?

Answer 1

the acromioclavicular joint

Question 2

what muscle is responsible for elevation and depression of the scapula as well as retraction of the scapula?

Answer 2

trapezius

Question 3

what innervates the trapezius?

Answer 3

CN XI

Question 4

what is the origin and insertion of the trapezius muscle?

Answer 4

spinous process

occiput; spine of scapula

Question 5

main purpose of the labrum?

Answer 5

increases capture of the humeral lead = increase in stability

Question 6

what stabilises the shoulder girdle and moves the arm?

Answer 6

the rotator cuff

Question 7

name the 4 muscle that contribute to the rotator cuff

Answer 7

subscapularis
supraspinatus
teres minor
infraspinatous

Question 8

what is the function of the supraspinatus?

Answer 8

arm abduction

Question 9

name the:

origin -
insertion -
innervation -

of the supraspinatus

Answer 9

origin - supraspinous fossa
insertion - greater tuberosity of humerus
innervation - supra scapular nerve (C5/6)

Question 10

name the:

origin -
insertion -
innervation -

of the infraspinatus

Answer 10

origin - infraspinous fossa
insertion - greater tuberosity of humerus
innervation - suprascapular nerve (C5/6)

Question 11

name the:

origin -
insertion -
innervation -

of teres minor

Answer 11

origin - Dorsal surface of lateral border of scapula

insertion - Greater tuberosity of humerus

innervation - axillary nerve (C5/C6)

Question 12

what is the function of the infraspinatus?

Answer 12

external rotation of arm

Question 13

what is the function of teres minor?

Answer 13

external rotation of arm

Question 14

name the:

origin -
insertion -
innervation -

of subscapularis

Answer 14

origin - Anterior surface of scapula (Subscapular fossa)

insertion - Lesser tuberosity of humerus/shoulder capsule

innervation - Upper & Lower subscapular n. (C5 / C6)

Question 15

what is the function of subscapularis?

Answer 15

internal rotation of the arm

Question 16

name the:

origin -
insertion -
innervation -

of the deltoid

Answer 16

Origin - clavicle, acromion, spine of scapula

Insertion: Deltoid tuberosity on lateral aspect of humerus

Innervation: Axillary n. (C5 / C6)

Question 17

what is the function of the deltoid?

Answer 17

abduction of the arm

Question 18

what is the function of the biceps brachii?

Answer 18

elbow flexion

supination of the forearm

Question 19

name the:

origin -
insertion -
innervation -

of the biceps brachii

Answer 19

Origin:

SHORT head: Coracoid process
LONG head: Labrum / glenoid

Insertion: Tuberosity of radius

Innervation: Musculocutaneous n. (C5 / C6)