A&P 6- wrist and hand
what are some common causes of carpal tunnel?
Fluid retention Infection Excessive exercise of the fingers
what forms the anatomical snuff box
The anatomical snuff box is formed by tendons of the abductor pollicis longus, extensor pollicis brevis, and extensor pollicis longus
what specific portion of the median nerve is affected by carpal tunnel?
The thenar branch of the median nerve
which digits experience hypoesthesia in carpal tunnel?
lateral 3 and 1/2 digits
what digits of the hand are supplied by the terminal sensory branches of the median nerve?
lateral three and one-half digits (thumb and fingers in the middle).
what nerve is involved in carpal tunnel?
median nerve
what are the motor manifestations of carpal tunnel?
progressive loss of coordination and strength unable to oppose the thumb
what is the thenar eminence ?
the bulge created on teh lateral surface of the palm formed by muscles of the thenar compartment
what arteries supply blood to the hand?
ulnar and radial artery
what nerve running through the wrist is not involved with the carpal tunnel syndrome?
ulnar nerve
what is carpal tunnel syndrome?
Carpal tunnel syndrome results from any lesion that significantly reduces the size of the carpal tunnel
what is the insertion, action, innervation and arterial supply of adductor pollicis?
Insertion: medial side of proximal phalanx of thumb Action: draws 1st metacarpal medially toward center of palm (adducts thumb) Innervation: ulnar nerve Arterial Supply: radial artery
what is the origin, insertion, action and innervation of the lumbricals?
Origin: distal portion of flexor digitorum profundus tendons Insertion: distal portion of extensor digitorum tendons Action: flexes and extends fingers Innervation: median and ulnar nerves
what is the origin, insertin, action, innervation and arterial supply of the opponens digiti minimi?
Origin: flexor retinaculum and hamate Insertion: medial 5th metacarpal Action: draws 5th metacarpal anteriorly, bringing little finger (5th digit) into opposition with thumb Innervation: ulnar nerve Arterial Supply: ulnar artery
what is the origin, insertin, action, innervation and arterial supply of the flexor digiti minimi brevis?
Origin: flexor retinaculum and hamate Insertion: medial side of proximal phalanx of little finger Action: flexes little (5th) finger Innervation: ulnar nerve Arterial Supply: ulnar artery
what is the origin, insertion, action, innervation and arterial supply of opponens pollicis?
Origin: flexor retinaculum, scaphoid, and trapezium Insertion: lateral 1st metacarpal Action: draws 1st metacarpal medially to oppose little finger toward center of palm Innervation: median nerve Arterial Supply: radial artery
what is the origin, insertion, action, innervation and arterial supply of abductor pollicis brevis?
Origin: flexor retinaculum, scaphoid, and trapezium Insertion: lateral side of proximal phalanx of thumb Action: abducts thumb <<and helps oppose it>> Innervation: median nerve Arterial Supply: radial artery
what is the origin, insertion, action, innervation and arterial supply of flexor pollicis brevis?
Origin: flexor retinaculum, scaphoid, and trapezium Insertion: lateral side of proximal phalanx of thumb Action: flexes thumb Innervation: median and ulnar nerves Arterial Supply: radial artery
what is the origin, insertin, action, innervation and arterial supply of the abductor digiti minimi?
Origin: pisiform Insertion: medial side of proximal phalanx of little finger Action: Abducts Innervation: ulnar nerve Arterial Supply: ulnar artery
what are the muscles of the hypothenar compartment?
abductor digiti minimi flexor digiti minimi brevis opponents digiti minimi
what are the muscles of the thenar compartment?
abductor pollicis brevis opponens pollicis
what is the action and innervation of the palmar interossei?
action:adducts and flexes fingers innervation: ulnar nerve
what structure forms the posterior wall of the carpal tunnel?
extensor retinaculum
what is the tendon found in the y-shaped split of the flexor retinaculum?
flexor carpi radialis
what structures are within the carpal tunnel?
flexor digitorum produndus flexor digitorum superficialis median nerve flexor pollicus longus synovial sheath
what structure forms the anterior wall of the carpal tunnel?
flexor retinaculum
what is the origin, action and innervation of dorsal interossei?
origin: metacarpals action: abducts digits, extends fingers innervation : ulnar nerve
what branch of the median nerve is not affected by carpal tunnel? why?
palmar cutaneous branch of the median nerve becauses it arises proximal to the carpal tunnel
what arteries form the superficicial palmar arch?
the superficial branch of the ulnar atery and the superficial branch if the radial artery
what do the names of the thenar and hypothenar compartment muscles have in common?
they are the same except thenar compartment is pollicis and the hypothenar and digiti minimi
