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Anatomy 11/14

Authored by Monica Manfredonia

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Anatomy 11/14
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14 questions

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1.

OPEN ENDED QUESTION

3 mins • 1 pt

List the bones of the hand from proximal to distal

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Answer explanation

Metacarpals —> proximal phalange/phalanx —> middle phalange/phalanx (not in the thumb) —> distal phalange/phalanx

2.

OPEN ENDED QUESTION

3 mins • 1 pt

List the 3 joints in the hand and the type of joint that they each are

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Answer explanation

Carpometacarpal Joints – plane type of synovial joint (thumb is a saddle type of synovial joint)  

THUMB: Flexion, extension, abduction, adduction, opposition, reposition  

Metacarpaophalangeal Joints – condyloid type of synovial joint  

Flexion, extension, abduction, adduction, circumduction  

THUMB: only flexion and extension  

Interphalangeal Joints (PIP and DIP)  – hinge type of synovial joint  

Flexion & extension  

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which structure forms the “fibro-osseous tunnel” designed to prevent bowstringing of tendons?   

Synovial sheath – flexor tendons

Extensor expansion  

Fibrous sheath – flexor tendons  

Palmar aponeurosis  

Answer explanation

Synovial sheath – flexor tendons  

*Radial bursa, common flexor sheath, digital sheath 

Extensor expansion  

*Insertion for extensor tendons  

Fibrous sheath – flexor

tendons  

*Enclose flexor tendons in their synovial sheaths, pulleys  

Palmar aponeurosis  

*Thickening in the palm for Palmaris longus insertion  

4.

OPEN ENDED QUESTION

3 mins • 1 pt

Name the four thenar muscles of the hand: 

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Answer explanation

Opponens pollicis 

Abductor pollicis brevis 

Flexor pollicis brevis 

Adductor pollicis  

5.

OPEN ENDED QUESTION

3 mins • 1 pt

What is the only muscle of the thenar muscles that is innervated only by the deep branch of the ulnar nerve (DBUN)? 

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Answer explanation

Adductor pollicis 

*Flexor pollicis brevis is innervated by both RBMN and DBUN

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Multiple choise: All of the thenar muscles insert onto the proximal phalanx of the thumb except: 

Opponens Pollicis: Inserts onto the lateral side of the first metacarpal 

Abductor pollicis brevis

Flexor pollicis brevis 

Adductor pollicis 

7.

OPEN ENDED QUESTION

3 mins • 1 pt

What are the main actions of the Lumbrical muscles? 

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Answer explanation

Flexion of MP joints, extension of IP joints 

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