Muscularture of the hand

Question 1

Which muscle categories are considered intrinsic musculature? (4)

Answer 1

Thenar imminence
hyothenar imminence
Lumbricals
Interossei

Question 2

What is the purpose of the flexor retinaculum?

Answer 2

tethers down the tendons to avoid bowstringing

Question 3

What is the point of bursa?

Answer 3

Provide synovial fluid for tendon gliding to reduce friction

Question 4

Which nerve courses under flexor retinaculum?

Answer 4

Median N.

Question 5

T/F Cruiciate pulleys alternate with annular pulleys. They are weaker than A1 pulley, which gives finger flexibility

Answer 5

True

Question 6

T/F Without annular pulleys, fingers would bowstring

Answer 6

True

Question 7

____ is the only extensor muscle of the PIP joint of the thumb.

Answer 7

Extensor pollicis longus

Question 8

Which ligament helps avoid displacement of the lateral bands and helps lateral bands descend during PIP flexion?

A. transverse retinacular ligaments
B. Oblique retinacular ligaments

Answer 8

A. Transverse Retinacular Ligaments

Question 9

This ligament is located on the dorsal proximal fibers covering the central slip. Its distal fibers join the lateral bands together as they insert on the distal phalanx

A. Transverse retinacular ligament
B. Oblique retinacular ligament

Answer 9

B. Oblique retinacular ligament

Question 10

What is the purpose of the extensor hood? Where are they located?

Answer 10

Stabilize the tendon over the MCP joint.

Question 11

T/F Lateral bands are joined by slips of lumbricals and dorsal interossei to form lateral bands.

Answer 11

True

Question 12

What structure(s) are responsible for finger extension?

Answer 12

Extensor Digitorum

Synergists that help:
Lumbricals Interossei
Retinacular ligament

Question 13

Which muscle is responsible for flexion and extension at IP joints? And what are the syngergists?

Answer 13

Lumbricals

SYngergists:
interossei
extensor digitorum
oblique retinacular ligament