Question 1

Which nerve roots contribute to the formation of the brachial plexus?

Accepted Answer

C5, C6, C7, C8, T1

Question 2

A patient presents with weakness in shoulder abduction and lateral rotation. Which muscle and nerve are most likely affected?

Accepted Answer

Supraspinatus, suprascapular nerve

Question 3

Which anatomical feature of the humerus articulates with the glenoid cavity of the scapula?

Accepted Answer

Head of the humerus

Question 4

The lateral cord of the brachial plexus is formed from which trunk and division?

Accepted Answer

Anterior divisions of the superior and middle trunks

Question 5

Which vein runs up the medial (inner) side of the arm and forearm?

Accepted Answer

Basilic vein

Question 6

A fracture at the surgical neck of the humerus is most likely to damage which nerve?

Accepted Answer

Axillary nerve

Question 7

Which ligament strengthens the acromioclavicular joint?

Accepted Answer

Acromioclavicular ligament

Question 8

Which muscle originates from the first rib and its costal cartilage and depresses the clavicle?

Accepted Answer

Subclavius

Question 9

The glenohumeral joint is classified as which type of synovial joint?

Accepted Answer

Ball and socket joint

Question 10

Which artery becomes the axillary artery at the lateral border of the first rib?

Accepted Answer

Subclavian artery

Question 11

If the median nerve is injured at the level of the brachial plexus, which function is most likely impaired?

Accepted Answer

Flexion of the forearm and sensation in the lateral palm

Question 12

Which structure attaches the coracoid process of the scapula to the clavicle?

Accepted Answer

Coracoclavicular ligament

Question 13

A patient has difficulty retracting the scapula. Which muscle is most likely weak?

Accepted Answer

Rhomboid major

Question 14

Which terminal branch of the brachial plexus innervates the muscles of the forearm and the skin of the lateral hand?

Accepted Answer

Median nerve

Question 15

Which bony landmark is found on the lateral side of the humerus and serves as the attachment for the deltoid muscle?

Accepted Answer

Deltoid tuberosity

Question 16

Which equation best represents the number of possible terminal branches ($$n) $$from the brachial plexus, given $$r$$ roots, $$t$$ trunks, $$d$$ divisions, and $$c$$ cords, if each cord gives rise to $$b$$ branches?

Accepted Answer

$$n = c 	imes b$$

Question 17

Which muscle is responsible for stabilizing the scapula by holding its medial border against the thoracic wall?

Accepted Answer

Serratus anterior

Question 18

A patient has a lesion affecting the posterior cord of the brachial plexus. Which terminal branch is most likely affected?

Accepted Answer

Radial nerve

Question 19

Which joint allows for the greatest range of movement in the upper limb?

Accepted Answer

Glenohumeral joint

Question 20

Which equation describes the total number of anterior divisions ($$A) in $$the brachial plexus, given $$S$$ superior, $$M$$ middle, and $$I$$ inferior trunks?

Accepted Answer

$$A = S + M + I$$

Anatomy of the Shoulder Girdle and Upper Limb: Brachial Plexus, Bones, Joints, Vessels, and Muscles

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