What are the 2 Groups, which the Muscles that act on the Hand, can be Divided into?
- Extrinsic Muscles
2. Intrinsic Muscles
Where are the Extrinsic Muscles of the Hand located?
- Anterior Compartment of the Forearm
2. Posterior Compartment of the Forearm
What are the functions of the Extrinsic Muscles of the Hand?
- Control Crude Movements
2. Produce a Forceful Grip
Where are the Intrinsic Muscles of the Hand located?
Within the Hand itself
What is the function of the Intrinsic Muscles of the Hand?
Fine Motor Control of the Hand
What are the 5 Muscle Compartments, of the Intrinsic Muscles of the Hand?
- Thenar Muscle Compartment
- Hypothenar Muscle Compartment
- Adductor Compartment
- Lumbricals and Long Flexor Tendons (Central) Compartment
- Interossei Compartment
Where are the Interossei Compartment Muscles located?
Between the Metacarpals
Between - Inter; Metacarpal Bones - Ossei = Interossei
How many Groups of Interossei Compartment Muscles are there?
2
What are the 2 Groups of Interossei Compartment Muscles?
- Dorsal Interossei
2. Palmar Interossei
How many Dorsal Interossei Muscles are there?
4
Where are the Dorsal Interossei Muscles located, in relation to other Dorsal Muscles?
These are the Most-Superficial
- Can the Dorsal Interossei Muscles be palpated?
2. If yes, where?
- Yes
2. On the Dorsum of the hand
Where do the Dorsal Interossei Muscles Originate from?
- Lateral Surface of the Medial Metacarpal
2. Medial Surface of the Lateral Metacarpal
Where do the Dorsal Interossei Muscles attach distally?
- Extensor Hood of each Finger
2. Proximal Phalanx of each Finger
What is the function of the Dorsal Interossei Muscles?
Abduction of the Fingers at the Metacarpophalangeal Joint
What is the innervation of the Dorsal Interossei Muscles?
Deep Branches of the Ulnar Nerve
How many Palmar Interossei Muscles are there?
3
Where are the Palmar Interossei Muscles located?
On the Palmar Surface of the Hand
Where do the Palmar Interossei Muscles Originate from?
- Medial Surface of the Metacarpal of the Index Finger
- Lateral Surface of the Metacarpal of the Ring Finger
- Lateral Surface of the Metacarpal of the Little Finger
Where do the Palmar Interossei Muscles attach distally?
- Extensor Hood of the Same Finger
2. Proximal Phalanx of the same Finger
What is the function of the Palmar Interossei Muscles?
Adduction of the Finger at the Metacarpophalangeal Joint
What is the innervation of the Palmar Interossei Muscles?
Deep Branches of the Ulnar Nerve
What other functions do both the Dorsal and Palmar Interossei Muscles perform?
Assist Lumbrical Muscles in Flexion of the Metacarpophalangeal Joint, and Extension of the Interphalangeal Joints
