Foot Anatomy

Intrinsic muscles

Intrinsic muscles

________: found within the foot and primarily act to move the toes and support foot arches to maintain foot structure.

lateral plantar

Laterally: on each side, attached to metatarsal bones by medial and ________ intermuscular septa.

Sole/plantar aspect

the bottom of the foot

extrinsic muscles

found in the lower leg, act to dorsiflex, plantarflex, invert and evert the foot

Adductor hallucis (originates by 2 heads

oblique and transverse)

medial plantar nerve

largest and accompanies medial plantar artery

lateral plantar nerve

smallest and accompanies lateral plantar artery

main function of foot arches

to support body weight and act as a lever to propel the body

lateral longitudinal arch keystone

cuboid

forming bones of the transverse arch

Cuboid, 3 cuneiforms, base of metatarsal bones

the forming bones of the medial longitudinal arch

Calcaneus, talus, navicular, 3 cuneiform bones, medial 3 metatarsal bones

2 sesamoid bones in the tendon of

adductor hallucis

4th lumbrical muscle supplied by which nerve

Lateral plantar nerve

planter interossei muscles are in the ___ layer of the foot

fourth

medial longitudinal arch keystone

talus

transverse arch keystone

intermediate cuneiform

most important muscle supporting transverse arch

fibularis longus

the forming bones of the lateral longitudinal arch

Calcaneus, cuboid, lateral 2 metatarsal bones

2 terminal branches of tibial nerve

medial plantar nerve

lateral plantar nerve

Medial plantar nerve branches

1. Muscular:

   • abductor hallucis

   • flexor digitorum brevis

   • 1st lumbrical muscle

   • flexor hallucis brevis

2. Cutaneous

   • medial 2/3 of the sole

Lateral plantar nerve branches

1. Muscular:

   • abductor digiti minimi

   • 2nd, 3rd, 4th lumbrical muscle

   • adductor hallucis

   • flexor digiti minimi brevis

   • all interossei (4th layer)

2. Cutaneous

   • lateral 1/3 of the sole

Plantar interossei supplied by ____ nerve

Lateral plantar nerve

Dorsal interossei supplied by ____ nerve

Lateral plantar nerve

Adductor hallucis supplied by ____ nerve

Lateral plantar nerve

Flexor digiti minimi brevis supplied by ____ nerve

Lateral plantar nerve

Quadratus plantae supplied by ____ nerve

Lateral plantar nerve

lateral 3 Lumbrical muscles supplied by ____ nerve

Lateral plantar nerve

Abductor digiti mini supplied by ____ nerve

Lateral plantar nerve

Abductor hallucis supplied by ____ nerve

medial plantar nerve

Flexor digitorum brevis supplied by ____ nerve

medial plantar nerve

1st lumbrical muscle supplied by

medial plantar nerve

Flexor hallucis brevis supplied by

medial plantar nerve

Tendon of flexor digitorum longus crosses superficial to flexor hallucis longus to reach insertion in the _____ layer of the foot

second

terminal branches of posterior tibial artery

Medial plantar artery

Lateral plantar artery