3.4.5. Interossei Muscle Compartment

Question 1

What are the 2 Groups, which the Muscles that act on the Hand, can be Divided into?

Answer 1

1. Extrinsic Muscles
2. Intrinsic Muscles

Question 2

Where are the Extrinsic Muscles of the Hand located?

Answer 2

1. Anterior Compartment of the Forearm
2. Posterior Compartment of the Forearm

Question 3

What are the functions of the Extrinsic Muscles of the Hand?

Answer 3

1. Control Crude Movements
2. Produce a Forceful Grip

Question 4

Where are the Intrinsic Muscles of the Hand located?

Answer 4

Within the Hand itself

Question 5

What is the function of the Intrinsic Muscles of the Hand?

Answer 5

Fine Motor Control of the Hand

Question 6

What are the 5 Muscle Compartments, of the Intrinsic Muscles of the Hand?

Answer 6

1. Thenar Muscle Compartment
2. Hypothenar Muscle Compartment
3. Adductor Compartment
4. Lumbricals and Long Flexor Tendons (Central) Compartment
5. Interossei Compartment

Question 7

Where are the Interossei Compartment Muscles located?

Answer 7

Between the Metacarpals
(Between - Inter; Metacarpal Bones - Ossei = Interossei)

Question 8

How many Groups of Interossei Compartment Muscles are there?

Answer 8

2

Question 9

What are the 2 Groups of Interossei Compartment Muscles?

Answer 9

1. Dorsal Interossei
2. Palmar Interossei

Question 10

How many Dorsal Interossei Muscles are there?

Answer 10

4

Question 11

Where are the Dorsal Interossei Muscles located, in relation to other Dorsal Muscles?

Answer 11

These are the Most-Superficial

Question 12

1. Can the Dorsal Interossei Muscles be palpated?
2. If yes, where?

Answer 12

1. Yes
2. On the Dorsum of the hand

Question 13

Where do the Dorsal Interossei Muscles Originate from?

Answer 13

1. Lateral Surface of the Medial Metacarpal
2. Medial Surface of the Lateral Metacarpal

Question 14

Where do the Dorsal Interossei Muscles attach distally?

Answer 14

1. Extensor Hood of each Finger
2. Proximal Phalanx of each Finger

Question 15

What is the function of the Dorsal Interossei Muscles?

Answer 15

Abduction of the Fingers at the Metacarpophalangeal Joint

Question 16

What is the innervation of the Dorsal Interossei Muscles?

Answer 16

Deep Branches of the Ulnar Nerve

Question 17

How many Palmar Interossei Muscles are there?

Answer 17

3

Question 18

Where are the Palmar Interossei Muscles located?

Answer 18

On the Palmar Surface of the Hand

Question 19

Where do the Palmar Interossei Muscles Originate from?

Answer 19

1. Medial Surface of the Metacarpal of the Index Finger
2. Lateral Surface of the Metacarpal of the Ring Finger
3. Lateral Surface of the Metacarpal of the Little Finger

Question 20

Where do the Palmar Interossei Muscles attach distally?

Answer 20

1. Extensor Hood of the Same Finger
2. Proximal Phalanx of the same Finger

Question 21

What is the function of the Palmar Interossei Muscles?

Answer 21

Adduction of the Finger at the Metacarpophalangeal Joint

Question 22

What is the innervation of the Palmar Interossei Muscles?

Answer 22

Deep Branches of the Ulnar Nerve

Question 23

What other functions do both the Dorsal and Palmar Interossei Muscles perform?

Answer 23

Assist Lumbrical Muscles in Flexion of the Metacarpophalangeal Joint, and Extension of the Interphalangeal Joints