Download Muscles of the Foot

Muscles of the Foot
Muscles of the Foot
Images:
Draves DJ, Anatomy of the Lower Extremity, Williams &
Wilkins, 1986
Text:
Draves DJ, Anatomy of the Lower Extremity, Williams &
Wilkins, 1986
Logan BM, McMinn’s Colour Atlas of Foot & Ankle
Anatomy 4th Ed, Elsevier, 2012
Anatomy.TV Primal’s Atlas of Human Anatomy of the Leg,
Ankle and Foot, 2014
Anatomy APP QUT Podiatric Anatomy 2016
Extensor Digitorum Brevis Muscle
• Origin:
• Insertion:
• Action:
• Innervation:
Extensor Digitorum Brevis Muscle
• Origin:
– Anterior-lateral dorsal
calcaneus, anterior to the
sinus tarsi
• Insertion:
– Dorsal base proximal phalanx
of hallux (EHB) & lateral side
of 2-4 dorsal digital (extensor)
expansions
• Action:
– Extension of 1-4 toes
• Innervation:
– Deep fibular (peroneal) L5, S1
Abductor Hallucis Muscle
• Origin:
• Insertion:
• Action:
• Innervation:
Abductor Hallucis Muscle
• Origin: (1st layer)
– Medial process calcaneal
tuberosity & adjoining
plantar fascia
• Insertion:
– Medial base proximal
phalanx of hallux
• Action:
– Abduction & plantarflexion
of hallux
• Innervation:
– Medial plantar
Flexor Digitorum Brevis Muscle
• Origin:
• Insertion:
• Action:
• Innervation:
Flexor Digitorum Brevis Muscle
• Origin: (1st layer)
– Medial process calcaneal
tuberosity & adjoining plantar
fascia
• Insertion:
– Plantar shaft of middle
phalanx of toes 2-5
– Note: FDB tendon splits for
FDL tendon to pass through
• Action:
– Plantar flexion proximal IPJ
toes 2-5
• Innervation:
– Medial plantar
Abductor Digiti Minimi Muscle
• Origin:
• Insertion:
• Action:
• Innervation:
Abductor Digiti Minimi Muscle
• Origin: (1st layer)
– Medial & lateral process
calcaneal tuberosity &
adjoining plantar fascia
• Insertion:
– Lateral base proximal
phalanx 5th toe
• Action:
– Abduct & plantarflex 5th
toe at MPJ
• Innervation:
– Lateral plantar
Quadratus Plantae Muscle
• Origin:
• Insertion:
• Action:
• Innervation:
Quadratus Plantae Muscle
• Origin: (2nd layer)
– Medial head medial plantar
calcaneus
– Lateral head lateral plantar
calcaneus
– Both anterior to tuberosity
– Note: 2 heads separated at
origin by long plantar ligament
• Insertion:
– FDL tendon just proximal to
division into 4 tendons
• Action:
– Straightens line of pull for FDL
• Innervation:
– Lateral plantar
Lumbrical Muscles
• Origin:
• Insertion:
• Action:
• Innervation:
Lumbrical Muscles
• Origin: (2nd layer)
– 1st lumbrical medial side of FDL
tendon to 2nd toe
– 2-4 lumbricals medial & lateral
sides of FDL tendons to 3-5
toes
• Insertion:
– Medial side of 2-5 dorsal digital
(extensor) expansions
• Action:
– Plantarflexion 2-5 MPJ and
extension 2-5 IPJs
• Innervation:
– 1st lumbrical medial plantar
– 2-4 lumbricals lateral plantar
Flexor Hallucis Brevis Muscle
• Origin:
• Insertion:
• Action:
• Innervation:
Flexor Hallucis Brevis Muscle
•
Origin: (3rd layer)
– Y shaped tendinous origin
– Lateral limb plantar cuboid anterior to
peroneal groove
– Medial limb tendon to metatarsals from
tibialis posterior
– Note: Y shaped tendon origin becomes
single tendon which becomes 2 muscle
bellies
•
Insertion:
– Medial & lateral plantar base of
proximal phalanx of hallux
– Note: Sesamoid bone at each muscle
tendon junction, plantar to 1st
metatarsal head
•
Action:
– Flexion 1st MPJ
•
Innervation:
– Medial plantar
Adductor Hallucis Muscle
• Origin:
• Insertion:
• Action:
• Innervation:
Adductor Hallucis Muscle
• Origin: (3rd layer)
– Oblique head: plantar 2-4
metatarsal bases & fibularis
(peroneus) longus tendon sheath
– Transverse head: 3-5 MPJ plantar
ligaments & deep transverse
metatarsal ligaments
• Insertion:
– Lateral sesamoid & lateral base of
proximal phalanx of hallux with
FHB
• Action:
– Oblique & transverse: Adduction of
hallux
– Oblique: flexion of hallux
• Innervation:
– Lateral plantar
Flexor Digiti Minimi Brevis Muscle
• Origin:
• Insertion:
• Action:
• Innervation:
Flexor Digiti Minimi Brevis Muscle
• Origin: (3rd layer)
– Plantar base 5th metatarsal
& fibularis (peroneus)
longus tendon sheath &
adjoining plantar fascia
• Insertion:
– Plantar lateral base of
proximal phalanx of 5th toe
• Action:
– Flexion & abduction of 5th
toe at MPJ
• Innervation:
– Lateral plantar
Plantar Interossei Muscles
• Origin:
• Insertion:
• Action:
• Innervation:
Plantar Interossei Muscles
• Origin: (4th layer)
– Base & medial shaft of 3-5
metatarsals
• Insertion:
– Medial base proximal phalanx
& dorsal digital (extensor)
expansion toes 3-5
• Action:
– Adduction of toes 3-5
– Note: PAD (plantar abduction)
• Innervation:
– Lateral plantar
Dorsal Interossei Muscles
• Origin:
• Insertion:
• Action:
• Innervation:
Dorsal Interossei Muscles
• Origin: (4th layer)
– From the adjacent side of proximal
shaft of each inter-metatarsal
space
– Note: 2 heads to each muscle
• Insertion:
– Dorsal digital (extensor) expansion
of 2-4 toes
– 1st DI: medial base of proximal
phalanx of 2nd toe
– 2-4 DI: lateral base of proximal
phalanx of 2-4 toes
• Action:
– Abduction of toes 2-4
– Note: DAB (dorsal adduction)
• Innervation:
– Lateral plantar