Intro to the Upper Limb

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What nerves innervate the skin of the hand according to the text?

T2-T4

C6-C8 (correct)

T1-T3

C5-C7

Which nerve predominantly controls abduction and adduction of the index, middle, and ring fingers?

C6

T1 (correct)

C5

C7

Which nerve is responsible for innervating the medial one and one-half digits?

Radial nerve

Median nerve

Musculocutaneous nerve

Ulnar nerve (correct)

Which nerve is associated with the anterior compartment of the forearm?

Median nerve Signup and view all the answers

Which dermatome is responsible for innervating the palmar surface of the lateral three and one-half digits?

C6 Signup and view all the answers

Innervation of the intrinsic muscles of the hand is primarily by which spinal nerves?

C8, T1 Signup and view all the answers

What is the primary blood supply of the posterior compartment of the forearm?

Radial artery Signup and view all the answers

Which artery supplies the superficial palmar arterial arch and branches of the hand?

Ulnar artery Signup and view all the answers

Which test mainly checks for spinal cord level C7 by tapping on a specific tendon?

Tapping on triceps tendon posterior to the elbow Signup and view all the answers

Which nerve is responsible for digit adduction and abduction in the hand?

Ulnar nerve Signup and view all the answers

What divides the limb into compartments in the forearm?

Interosseous membrane Signup and view all the answers

Which of the following is NOT a part of the structural relationships within the context of sectional anatomy for the upper limb?

Innervation of the upper extremity Signup and view all the answers

What is the primary function of the superficial and deep fascia of the upper extremity in terms of myofascial compartments?

To contain and separate the muscles and neurovascular structures Signup and view all the answers

Which of the following is a key difference between hand and foot plates in upper and lower limb development?

Foot plates have more digital rays than hand plates Signup and view all the answers

What is the primary importance of myotome and dermatome formation in limb development?

To facilitate the development of the nerve distribution Signup and view all the answers

Which of the following is a key function of the deep lymphatic drainage in the upper extremity?

To remove waste products from the tissues Signup and view all the answers

Which of the following is NOT a key aspect of the development of the nerve distribution to the limbs?

The rotation of the limb axes Signup and view all the answers

Which nerve is responsible for the cutaneous innervation of the upper limb?

All of the above Signup and view all the answers

What type of joint is the acromioclavicular joint?

Synovial plane joint Signup and view all the answers

What is the primary function of the glenoid labrum in the glenohumeral joint?

All of the above Signup and view all the answers

Which ligament is responsible for connecting the coracoid process to the clavicle?

Coracoclavicular ligament Signup and view all the answers

What is the only articulation between the upper limb and the axial skeleton?

Sternoclavicular joint Signup and view all the answers

What is the primary function of the tendons of the rotator cuff muscles in the glenohumeral joint?

To reinforce the joint capsule posteriorly, superiorly, and anteriorly Signup and view all the answers

Which of the following statements about limb development is correct?

The upper limb buds appear a few days before the lower limb buds. Signup and view all the answers

What is the composition of the limb bud?

Mesenchyme derived from somatic mesoderm and covered by ectoderm. Signup and view all the answers

What is the function of the apical ectodermal ridge?

It exerts an inductive influence on the underlying mesenchyme, causing it to grow and differentiate. Signup and view all the answers

What happens to the tissue forming the webbing between the digits?

It breaks down to form separate digits. Signup and view all the answers

Which border of the limb bud gives rise to the thumb?

The cranial or preaxial border. Signup and view all the answers

What is the appearance of the distal end of the limb after the tissue between the digits breaks down?

It resembles a hand-like or foot-like structure. Signup and view all the answers