Origin of
Limb Muscles
Dorsal muscle mass forms extensors and supinators in upper limb, extensors and abductors in lower limb.
Ventral muscle mass forms flexors and pronators in upper limb and flexors and adductors in lower limb.
Morphogenesis guided by CT, not myoblasts
Split into individual muscles, cell death involved
Carlson l999 Human Embryology Larsen 1993
1) trapezius m.2) latissimus dorsi
m.3) levator scapulae
m.4) rhomboideus
major m.5) rhomboideus
minor m.6) serratus anterior
m.
1) infraspinatus m.
2) supraspinatus m.
3) subscapularis m.
4) teres minor m.
5) teres major m.
6) deltoid m.
Extrinsic shoulder mm.Intrinsic shoulder mm.
Anterior thorax mm.1) pectoralis major and minor mm.
2) subclavius m.
brachium
biceps brachii m.
long head short
head brachialis m. coracobrachial
is m.
triceps brachii m.
lateral head
medial head
long head anconeus m.
antr compartment
postr compartment
musculocutaneous n.
(C5-C7)
Netter’s Atlas of Human Anatomy 2nd ed
biceps brachii m.
brachialis m.
coracobrachialis m.
axillary n. (C5-C6)
radial n. (C5-T1)
Netter’s Atlas of Human Anatomy 2nd ed
deltoid m.teres minor m.
triceps brachii m.anconeus m.
(brachialis m.)
antebrachium
pronator teres m. flex. carpi radialis
m. palmaris longus m. flex. carpi ulnaris m. flex. digit. superf. m. flex. digit. profund.
m. flex. pollicis longus
m. pronator quadratus
m.
brachioradialis m. ext. carpi radialis
longus m. ext. carpi radialis
brevis m. ext. carpi ulnaris m. extensor digitorum m. extensor digiti minimi
m. extensor indicis m. abd pollicis longus m. ext. pollicis
longus/brevis m. supinator m.
antr compartment
postr compartment
radial n. (C5-T1)
Netter’s Atlas of Human Anatomy 2nd ed
triceps brachii m., anconeus m.
(brachialis m.)
BR, ECRL, ECRB, ED, EDM, supinator, ECU, EI, AbdPL, EPL, EPB
ulnar n. (C7-T1)
Netter’s Atlas of Human Anatomy 2nd ed
flex carpi ulnaris m.
medial ½ FDP
+ 14 intrinsic handmuscles
median n. (C5-T1)
Netter’s Atlas of Human Anatomy 2nd ed
PT, FCR, PL, FDS, lat ½ FDP, FPL, PQ
+ 5 intrinsic handmuscles
intrinsic hand muscles
7 interosseii mm. (4 dorsal/3 palmar) 4 lumbrical mm. (1, 2, 3, 4) palmaris brevis m. adductor pollicis m. three thenar mm. (OP, abd.PB, FPB) three hypothenar mm. (ODM,
abd.DM, FDMB)
intrinsic hand muscles
7 interosseii mm. (4 dorsal/3 palmar) 4 lumbrical mm. (1, 2, 3, 4) palmaris brevis m. adductor pollicis m. three thenar mm. (OP, abd.PB,
FPB) three hypothenar mm. (ODM,
abd.DM, FDMB) (median n.) (ulnar n.)
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