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
How many Hypothenar Muscles are there?
3
Where are the Hypothenar Muscles located?
- Medial Aspect of the Palm
2. Base of the Little Finger
What is the name of the Bulge which the Hypothenar Muscle Bellies produce?
Hypothenar Eminence
What innervated the Hypothenar Muscles?
Deep Branches of the Ulnar Nerve
What are the 3 Hypothenar Muscles?
- Opponens Digiti Minimi
- Abductor Digiti Minimi
- Flexor Digiti Minimi Brevis
Where is the Opponens Digiti Minimi located, in relation to the other 2 Hypothenar Muscles?
Deep to the other 2 (Underneath)
Where does the Opponens Digiti Minimi Originate from?
- Hamate
2. Associated Flexor Retinaculum
Where does the Opponens Digiti Minimi attach distally?
Medial Margin of the Fifth Metacarpal
- What is the function of the Opponens Digiti Minimi?
2. How does it do this?
- Opposes the Little Finger
2. Rotation of the Metacarpal of the Little Finger towards the Palm
What is the innervation of the Opponens Digiti Minimi?
Deep Branch of the Ulnar Nerve
Where is the Abductor Digiti Minimi located, in relation to the other 2 Hypothenar Muscles?
It is the most Superficial of the Hypothenar Muscles
Where does the Abductor Digiti Minimi Originate from?
- Pisiform
2. Tendon of the Flexor Carpi Ulnaris
Where does the Abductor Digiti Minimi attach distally?
Base of the Proximal Phalanx of the Little Finger
What is the function of the Abductor Digiti Minimi?
Abducts the Little Finger
What is the innervation of the Abductor Digiti Minimi?
Deep Branch of the Ulnar Nerve
Where is the Flexor Digiti Minimi Brevis located, in relation to the other 2 Hypothenar Muscles?
- Superficial / Anterior to the Opponens Digiti Minimi
2. Laterally to the Abductor Digiti Minimi
Where does the Flexor Digiti Minimi Brevis Originate from?
- Hook of the Hamate
2. Adjacent Flexor Retincaulum
Where does the Flexor Digiti Minimi Brevis attach distally?
Base of the Proximal Phalanx of the Little Finger
What is the function of the Flexor Digiti Minimi Brevis?
Flexion of the Metacarpophalangeal Joint of the Little Finger
What is the function of the Flexor Digiti Minimi Brevis?
Deep Branch of the Ulnar Nerve
