Hand Flashcards
What is the Extensor Retinaculum?
The extensor retinaculum is a band of connective tissue that holds and supports the tendons of certain extensor muscles in place as they cross the wrist and ankle joints. It acts like a strap, keeping the tendons in position and preventing them from bowing outward during muscle contraction. In simpler terms, it helps maintain the alignment and stability of extensor tendons as they pass over joints, facilitating smooth and controlled movements.
Finger Flexor Complex:
Vinculum:
A vinculum in anatomy generally refers to a band or ligament that connects or binds structures together.
What are the Wrist Joints?
Radiocarpal Joint: Condyloid
scaphoid, lunate, and triquetrum
Distal Radioulnar Joint: Pivot
Joints of the Hand: (3)
Intermetacarpal Joints
Carpometacarpal Joints
Midcarpal Joint
Intermetacarpal Joints
Type: Plane (gliding) joints.
Connection: Articulations between individual metacarpal bones.
Carpometacarpal Joints
Plane (gliding) joints for digits 2-5;
saddle joint for the thumb (first digit).
Articulations between the carpal bones and the metacarpal bones of the hand.
Midcarpal Joints
Type: Plane and Condyloid Joints
Connection: Located between the proximal and distal rows of carpal bones.
Joints of the Fingers: (3)
Metacarpophalangeal Joints (MCP Joints):
Proximal Interphalangeal Joints (PIP Joints):
Distal Interphalangeal Joints (DIP Joints):
Metacarpophalangeal Joints (MCP Joints):
The articulations between the metacarpal bones (hand bones) and the proximal phalanges (finger bones).
condyloid joint
Proximal Interphalangeal Joints (PIP Joints):
Type: Hinge joints.
Location: Situated between the proximal and middle phalanges.
Distal Interphalangeal Joints (DIP Joints):
Type: Hinge joints.
Location: Found between the middle and distal phalanges.
The Carpal Tunnel
The carpal tunnel is a narrow passageway in the wrist formed by bones and ligaments. It houses the median nerve and tendons that control the movement of the fingers
What is the Transverse Carpal Ligament (Flexor Retinaculum)?
Transverse Carpal Ligament (Flexor Retinaculum): This is a strong band of connective tissue that forms the roof of the carpal tunnel, creating a protective tunnel-like structure.
Cutaneous Innervation of the Hand
dermatomes of hand
