P3 ANATOMY Flashcards
not yet completed
which bone is stable & which is movable in pronation
ulna > stable
Radius > movable
how many carpals bone are there
name them
8
1- scaphoid
2- trapezium
3- trapezoid
4- lunate
5- pisiform
6- capitate
7- hamate
8- triquetrum
which carpal bone is the largest
capitate
finger that has only proximal & distal phalanges
thumb
how many metacarpals are there
5
how many phalanges are there
14
joint type in DIP & PIP
hinge synovial
type of joint in CM of thumb
saddle
from lateral to medial mention the superficial group of flexors
Pronator teres.
Flexor carpi radialis.
Palmaris longus.
Flexor carpi ulnaris.
flexor muscles arise from
medial epicondyle
extensor muscles arise from
lateral epicondyle
a flexor muscle that does not cross wrist joint
pronator teres
action of pronator teres
pronation of forearm especially during flexion of elbow joint.
action of flexor carpi radials
Flexes and abducts hand at the wrist joint
action of palmaris longus
flexion of the hand at wrist joint.
action of flexor carpi ulnaris
flexion and adduction of the hand at wrist joint
action of Flexor digitorum superficialis
lexion of MP and proximal IP joints of
medial 4 fingers.
Helps of flexion of wrist joint.
innervation of superficial & intermediate groups
median nerve
nerve that innervates flexor carpi ulnaris
ulnar nerve
lateral 1/2 of FDP is innervated by
ant. inter-osseous nerve
middle 1/2 of FDP is innervated by
ulnar nerve
action of FDP
Flexion of MP, proximal IP & distal IP (all)
joints of medial 4 fingers.
Helps in flexion of wrist joint
action of flexor pollicis longus
lexion of MP and IP (all)
joints of the thumb.
action of pronator quadratus
Pronation of forearm at radioulnar joints.
Thickened band of deep fascia bridges over the carpal groove
FLEXOR RETINACULUM
thickened band of deep fascia bridges over the carpal groove transforming it into
carpal tunnel.
FLEXOR RETINACULUM medial attachments
pisiform and hook of hamate.
FLEXOR RETINACULUM lateral attachments
scaphoid and trapezium.
CONTENTS OF CARPAL TUNNEL
- median nerve
- 4 FDP
- 4 FDS
- 1 flexor pollicis longus
nerve compressed in carpal tunnel syndrome
median nerve
Number of muscle in post. Compartment / extensors
12
Origin of all extensor muscles
lateral epicondyle
Extensor Muscles of superficial group
Brachioradialis.
Extensor carpi radialis longus.
Extensor carpi radialis brevis.
Extensor digitorum. Extensor digiti minimi. Extensor carpi ulnaris.
Anconeus.
Action of Brachioradialis.
Flexes forearm especially in midprone
position.
Initiation of pronation and supination.
Action of Extensor carpi radialis longus.
Extends wrist joint and abducts hand.
action of Extensor carpi radialis brevis
Extends wrist joint and abducts hand.
action of Extensor digitorum
Extends MP, proximal IP and distal IP joints of medial 4 fingers.
Extends the wrist.
action of Extensor digiti minimi
Extends all joints of little finger.
Extends wrist joint.
action of Extensor carpi ulnaris
Extends wrist joint and adducts the hand.
action of Anconeus
Extends elbow joint.
mention from lateral to medial extensor muscles of deep group
1- Abductor pollicis longus.
2. Extensor pollicis brevis.
3. Extensor pollicis longus.
4. Extensor indices.
5. Supinator.
action of Abductor pollicis longus
Abduction of thumb at CM joint.
action of Extensor pollicis brevis
extension of thumb at CM and MP joints.
Action ofExtensor pollicis longus
Extends the thumb at CM, MP and IP joints.
Action of Extensor indicis
Extends index finger at MP,
proximal IP, and distal IP joints.
Extend wrist.
action of Supinator
Supinates the forearm
innervation of Brachioradialis, extensor carpi radialis longus and anconeus
radial nerve
rest of extensors are supplied by
POSTERIOR INTEROSSEUS NERVE.
Thickened band of deep fascia on the back of wrist joint.
EXTENSOR RETINACULUM
Medial attachment of EXTENSOR RETINACULUM
triquetrum and pisiform bones.
lateral attachment of EXTENSOR RETINACULUM
lower part of anterior border of the radius.
Muscles of supination
Biceps brachii ,Supinator
Muscles of pronation
Pronator teres. Pronator quadratus.
lateral boundaries of anatomical snuff box
tendons of abductor pollicis longus and extensor pollicis brevis.
Medial boundaries of anatomical snuff box
extensor pollicis longus tendon
Contents of anatomical snuff box
radial art.
radial nerve
cephalic vein
action of Palmaris brevis
Wrinkles skin and deepens hollow of the palm, as in cupping of the hand, thereby improve the grip
Triangular thick band of deep fascia in the middle of the palm of hand.
PALMAR APONEUROSIS
clinical significance of PALMAR APONEUROSIS is seen in
Dupuytren’s contracture
mention THENAR MUSCLES
Abductor pollicis brevis
2. Flexor pollicis brevis
3. Opponens pollicis
4. Adductor Pollicis
Movements of thumb
- aduction
- abduction
- flexion
- extension
- opposition
- reposition
mention HYPOTHENAR MUSCLES
1-Abductor digiti minimi
2. Flexor digiti minimi
3. Opponens digiti minimi
PALMAR INTEROSSEI MUSCLES action
Adducts 2nd, 4th and 5th fingers (PAD) towards the axis
DORSAL INTEROSSEI MUSCLES action
Abducts 2nd - 4th fingers (DAP)
from the axis.
action of LUMBRICAL MUSCLES
together with palmar and dorsal interossei, flex digits at MCP joints and extend IP joints (writing position).
Intrinsic muscles are innervated by
deep branch of ulnar nerve
INTRNISIC MUSCLES OF THE HAND exception for the innervation by deep ulnar nerve are innervated by
median nerve
Is triangular fibrous sheath located in the dorsum of proximal phalanx.
EXTENSOR EXPANSION
FASCIAL COMPARTMENTS of the hand
. Thenar compartment contains 3 thenar muscles.
2. Hypothenar compartment:
contains 3 hypothenar muscles.
3. Central compartment: long flexor tendons and lumbricals.
2 spaces of the hand are
thenar space
mid - palmar space
Superficial Palmar Arch is mainly formed by
cont. of ulnar art.
branches of Superficial Palmar Arch
3 Common palmar digital arteries. Each of them divides into 2 Proper palmar digital arteries which run along the sides of 2nd – 4th fingers.
Deep Palmar Arch is mainly formed by
Direct continuation of radial
artery
branches of Deep Palmar Arch
3 palmar metacarpal arteries.
Princeps pollicis artery.
Radialis indicis artery.
Identify the deformity & the nerve injury
Partial CLAW HAND
ULNAR NERVE injury
Identify the deformity & the nerve injury
wrist drop
radial nerve injury
Identify the deformity & the nerve injury
ape hand seen in carpal tunnel syndrome
median nerve injury