ANAT: Palm of the Hand Flashcards
Carpal bones (proxolateral to distomedial)
Proximal row: Scaphoid, Lunate, Triquetral, Pisiform
Distal row: Trapezium, Trapezoid, Capitate, Hamate
Flexor retinaculum attachments
Medial: pisiform and Hook of Hamate
Lateral: Tubercles of Scaphoid and Trapezium
Contents of carpal tunnel proper
Tendons: flexor digitorum superficialis, flexor digitorum produndus, flexor pollicis longus
Median n.
Palmaris Brevis ORIGIN
medial palmar aponeurosis and flexor retinaculum
Palmaris Brevis INSERTION
skin of the medial palm
Palmaris Brevis ACTION
wrinkles the skin of the medial palm
Palmaris Brevis INNERVATION
Superficial branch of the Ulnar n.
Dupuytren’s contracture
Pathological fibrosus and shortening of the palmar aponeurosis or logitudinal digital bands creating traction of the fibrous digital sheaths resulting in flexure deformity of the digits (IV-V)
Common flexor synovial sheath (Ulnar bursa)
Common sheath enveloping tendons of the flexor digitorum superficialis and flexor digitorum profundus
-continuous distally with the digital synovial sheath of digit V
Synovial sheath of Flexor pollicis longus (radial bursa)
Lateral to the common synovial flexor sheath, continues distally with the digital synovial sheath of the thumb
Digital synovial sheaths
Envelop flexor tendons within the digital tunnels
-Synovial sheaths of digits II-IV terminate proximally at metacarpal mid-shaft, but digital sheaths of digits I and V are continuous with radial and ulnar bursae
Thenar muscles
Opponens pollicis, abductor pollicis brevis, flexor pollicis brevis
Thenar muscle [N]
Recurrent branch of the median n.
Thenar muscle [O]
Flexor retinaculum and bony attachments (pisiform, Hook of Hamate, and tubercles of Scaphoid and Trapezium)
Abductor pollicis brevis INSERTION
Base of proximal phalanx of the thumb
Abductor pollicis brevis [A]
Abducts the thumb
Flexor pollicis brevis [I]
Base of the proximal phalanx of the thumb
Flexor pollicis brevis [A]
Flexes CM and MP joints of the thumb
Opponens pollicis [I]
Lateral shaft of metacarpal 1
Opponens pollicis [A]
Opposes the thumb
Hypothenar muscles
Abductor digiti minimi, Flexor digiti minimi, Opponens digiti minimi
Hypothenar muscle [O]
Flexor retinaculum and attachments
Hypothenar muscle [N]
Deep branch of the ulnar n.
Abductor digiti minimi [I]
Medial base of the proximal phalanx of digit V
Abductor digiti minimi [A]
Abducts digit V
Flexor digiti minimi [I]
base of proximal phalanx of digit V
Flexor digiti minimi [A]
Flexes MP joint of digit V
Opponens digiti minimi [I]
Shaft of metacarpal V
Opponens digiti minimi [A]
oppose digit V
Adductor pollicis [O]
Transverse head: Shaft of metacarpal III
Oblique head: Capitate and bases of metacarpals II-III
Adductor pollicis [I]
Medial base of proximal phalanx of the thumb
Adductor pollicis [N]
Deep branch of the Ulnar n.
Adductor pollicis [A]
Adducts and flexes the thumb
Palmar interosseous muscles [O]
Shafts of metacarpals II, IV, and V
Palmar interosseous muscles [I]
Extensor expansions of digits II, IV, and V
Palmar interosseous muscles [A]
Adduction, flexion of MP joints; extension of DIP and DIP joints
Palmar interosseous muscles [N]
Deep branch of the Ulnar n.
Dorsal interosseous muscles [O]
bipennate muscles originating from adjacent metacarpal shafts
Dorsal interosseous muscles [I]
proximal phalangeal bases and extensor expansions of of digits II-IV
Dorsal interosseous muscles [A]
abduction, flexion of the MP joints; extension of PIP and DIP joints
Dorsal interosseous muscles [N]
Deep branch of the Ulnar n.
Lumbricals [O]
Tendons of flexor digitorum profundus m.
Lumbricals [I]
Lateral side of extensor expansions digits II-IV
Lumbricals [A]
Adduction of digits IV-V, abduction of digits II-III; Flexion of MP joints, extension of PIP and DIP joints
Lumbricals [N]
Lumbricals 1 and 2 by the median n.
Lumbricals 3 and 4 by the deep branch of the ulnar n.
