3.4.4. Lumbrical Muscle Compartment Flashcards
What are the 2 Groups, which the Muscles that act on the Hand, can be Divided into?
- Extrinsic Muscles
- Intrinsic Muscles
Where are the Extrinsic Muscles of the Hand located?
- Anterior Compartment of the Forearm
- Posterior Compartment of the Forearm
What are the functions of the Extrinsic Muscles of the Hand?
- Control Crude Movements
- 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 Muscles are in the Lumbrical Muscle Compartment?
4
What is the name of the Muscles in the Lumbrical Muscle Compartment?
Lumbrical Muscles
What are each of the 4 Lumbrical Muscles associated with?
4 Fingers
Where do the Lumbrical Muscles Originate from?
A Tendon of the Flexor Digitorum Profundus
Where do the Lumbrical Muscles travel?
Dorsal and Laterally around Each Finger
Where do the Lumbrical Muscles attach distally?
The Extensor Hood
What is the function of the Lumbrical Muscles?
These are Crucial for Finger Movement, linking the Extensor Tendons to the Flexor Tendons. They cause:
1. Flexion at the Metacarpophalangeal Joint
2. Extension at the Interphalangeal Joints
What is the innervation of the Lumbrical Muscles?
- Lateral 2 Lumbrical Muscles (Index and Middle Finger) are innervated by the Palmar Digital Branch of the Median Nerve
- Medial 2 Lumbrical Muscles (Ring and Little Fingers) are innervated by the Deep Branches of the Ulnar Nerve
