Chapter 13 A&K - The Hand
Extensor hood covers the head of the metacarpal and keeps the extensor tendon in the midline.
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What is an extrinsic muscle?
An extrinsic muscle has its proximal attachment above the wrist and its distal attachment below the wrist.
What is an intrinsic muscle?
An intrinsic muscle has both attachments below the wrist, the nine intrinsic muscles include the flexor and abductor pollicis brevis, the opponens and adductor pollicis, the flexor/.abductor/opponens digiti minimi, the interossei and the lumbricales.
The CMC is a saddle joint:
Both surfaces of the CMC are concave and convex.
Name the joints of the Thumb:
CMC, MCP and IP
Name the joints of the Fingers:
CMC, MCP, PIP and DIP
Thumb opposition is a combination of what motions?
Flexion and abduction
Which finger and thumb motion occur in the frontal plane around the sagittal axis?
Finger: MCP abduction/adduction Thumb: CMC flexion/extension, MCP and IP flexion/extension.
Which finger and thumb motion occur in the saggital plane around the frontal axis?
Finger: MCP, PIP, DIP flexion/extension Thumb: CMC abduction/adduction
How many bones in the fingers
Five (5)
How many bones in the thumb?
Four (4)
How many joints does the fingers have?
Four (4)
The thumb is the first digit.
It has three joints: The carpometacarpal joint (CMC), the metacarpophalangeal joint (MCP) and the Interphalangeal Joint (IP)
What is the purpose of the retinaculum?
It holds the entrinsic tendons close to the wrist.
The hand is the key point of function for the upper extremity.
It is extremely useful, versatile and complex.
The hand is the distal end of the upper extremity.
It is made up of the thumb, finger metacarpals and phalanges.
The 3 arches responsible for palmar concavity are;
Proximal carpal arch, distal carpal arch, longitudinal arch.
Which of the thumb opposition motions is an accessory motion?
Rotation
There are two interphalangeal joints in the fingers:
The PIP joint of the fingers and the DIP joint.
List the extrinsic muscles of the hand
The extrinsic muscles include the flexor digitorum superficialis and profundus, extensor digitorum, extensor digiti minimi, and extgensor indicis muscles of the fingers. Extrinsic muscles of the thumb are the flexor policis longus, abductor pollicis longus, and extensor pollicis longus and brevis.
Which tendons and nerve run through the carpal tunnel?
The flexor digitorium superficialis and profundus and the flexor pollicis longus muscles and the median nerve run through the carpal tunnel.
What structures make up the carpal tunnel?
The floor of the carpal tunnel is made up of the carpal bones, and the ceiling is the transverse carpal ligament portions of the flexor retinaculum.
How many joints does the thumb have?
Three (3)
Which finger and thumb motion occur in the transverse plane around the vertical axis?
Thumb: CMC opposition/reposition
Proximal carpal arch, distal carpal arch and the logitudinal arch
contributes to the function of various grasps.
Flexor Retinaculum is a:
fibrous ligament band that spans the anterior surface of the wrist in a mediolateral direction.
The MCP joint allows only:
flexion and extension and is a uniaxial joint.
The MCP joint is a:
hinge joint
The Carpometacarpal joints provide more stability than:
mobility
The CMC is considered a:
modified biaxial joint
Extensor Retinaculum is a:
small, triangular, flat aponeurosis covering the dorsum and sides of the proximal phalanx of the fingers.
Extensor hood is another name for:
the extensor expansion ligament.
The CMC joint is made up of the:
trapezium bone, which articulates with the base of the 1st metacarpal.
The PIP and DIP joints allow are:
uniaxial hinge joints and allow only flexion and extension.
