Hand Structures

extensor retinaculum

extensor retinaculum function

aligns tendons to facilitate motion and reduce friction, prevents bowstringing

extensor compartment 1

abductor pollicis longus and extensor pollicis brevis

extensor compartment 2

extensor carpi radialis longus and extensor carpi radialis brevis

extensor compartment 3

extensor pollicis longus

extensor compartment 4

extensor digitorum and extensor indicis

extensor compartment 5

extensor digiti minimi

extensor compartment 6

extensor carpi ulnaris

flexor retinaculum

parts of the flexor retinaculum

superficial/palmar carpal, deep layer, transverse carpal ligament

transverse carpal ligament

palmar carpal ligament

palmar aponeurosis

transverse fascicles

longitudinal fascicles

thenar fascia

hypothenar fascia

thenar compartment

hypothenar compartment

central compartment

adductor compartment

attachments for transverse carpal ligament

hook of hamate, pisiform, tubercle of trapezium, tubercle of scaphoid

tendons and nerves that run through carpal tunnel

flexor digitorum superficialis, flexor digitorum profundus, flexor pollicis longus, median nerve

flexor tendon sheath

flexor tendon sheath attachment

volar plates

flexor tendon sheath function

prevent bowstringing

components of flexor tendon sheath

fibrous outer part and synovial inner part

ulnar bursae

extensor hood/dorsal expansion

central band

distal portion of extensor digitorum

lateral bands

built from fibers of the intrinsic hand muscles

terminal tendon

triangular membrane of extensor aponeurosis

connects to each lateral band and holds them in place

oblique retinacular ligament

helps keep lateral bands in place

hand nerves responsible for motor and sensory information

ulnar and medial nerves

hand nerves responsible for only sensory information

radial nerve

superficial palmar arch

deep palmar arch