Regions.

Medial part
(postaxial)

II. Lower Limb. A. Cutaneous Nerves.

Lateral part Abductor pollicis brevis
(preaxial) | Opponens pollicis
Flexor pollicis brevis

Lateral two lumbricales
Medial two lumbricales
Interossei

Adductor pollicis (transverse
and oblique parts).
Abductor digiti quinti.
Opponens digiti quinti
Flexor digiti quinti brevis

Front of thigh and front part of buttock

(preaxial nerves)

Regions.

Lateral part of thigh Buttock
and buttock, back
and lower part
(postaxial nerves)

Dorsum of foot

2. Ventral (Anterior) Surface—continued.

Medial side and back of thigh

Back of leg

Regions.

Muscles.

1. Dorsal Surface.

(Front and lateral part of thigh, buttock, front of leg, dorsum of foot.)

Medial side
(preaxial)
Lateral side
(postaxial)

Medial side
(preaxial)
Lateral side
(postazial)

Medial side of
thigh
(preaxial)

Back of thigh
(postaxial)

Nerves.

Thigh Femoral, medial cutaneous

Median.

Genito-femoral (lumbo-inguinal
branch)

Nerves.

Ulnar.

2. Ventral Surface.

(Medial side and back of thigh, back of leg, and sole of foot.)

C. 8. (T. 1).

Spinal Origins. Preaxial. Postarial.

L. 1. 2. 3.

S. 1.-5.
Co.

L. (4). 5. S. 1.

S. 1. 2. 3.

Postaxial.

S. 1. 2. 3.
S. 1. (2).

Front of thigh

Lateral side
(postaxial)

Regions.

(Front and lateral part of thigh, buttock, front and lateral part of leg,

dorsum of foot.)

1. Dorsal Surface.

Spinal Origins. Preaxial. Postazial.

L. 3. 4.

L. 4. 5. S. 1.
L. 4. 5.

L. 4. 5. S. 1.

L. 4. 5. S. 1. 2.

Superior gluteal

Inferior gluteal
Common peroneal
Sacral plexus

S. 1. 2.

L. 5. S. 1.

Superficial pero

neal

S. 1. 2.

S. 1. (2).

(Medial side and back of thigh, back of leg, and sole of foot.)

Back of leg.

Sole of foot

Thigh, medial
side

(preaxial)

Thigh, lateral
side
(postaxial)

Buttock

Medial side
(preaxial)

2. Ventral Surface.

Lateral side
(postaxial)

A. Innervation of the Muscles of the Limbs.-The following laws appear to be applicable to the upper and lower limbs alike:

1. No limb-muscle receives its nerve-supply from posterior rami.

2. The dorsal and ventral strata of muscles are always supplied by the corresponding dorsal and ventral branches of the nerves concerned. The ventral muscular stratum is more extensive than the dorsal; the ventral nerves are the more numerous, and the additional nerves are postaxially placed. The spinal nerves supplying muscles of the upper limb are C. 5, 6, 7, 8 (dorsal), and C. 5, 6, 7, 8, T. 1 (ventral); the nerves for the muscles of the lower limb are L. 2, 3, 4, 5, S. 1, 2 (dorsal), and L. 2, 3, 4, 5, S. 1, 2, 3 (ventral).

3. The dorsal and ventral trunks of the nerves are distributed in the limb in a continuous, segmental manner; so that, "of two muscles, that nearer the head end of the body tends to be supplied by the higher nerve, and that nearer the tail end by the lower nerve" (Herringham).

4. The nerves placed most centrally in the plexus extend furthest into the limb, and the more preazial nerves terminate sooner in the limb than the more postaxial nerves.