A&P 1.14 Flashcards
Muscles of Pelvic Bowl
Iliacus
L: Pelvic bowl deep
O: Iliac crest & iliac fossa of ilum
I: Lesser trochanter of femur via tendon of Psoas Major
A: Flexion & lateral rotation of thigh at hip
Convergent fiber direction
Muscles of Pelvic Bowl
Psoas Major
“SO-AS”
L: Abdominal/pelvic cavity deep
O: Bodies, discs & transverse processes of lumbar vertebrae
I: Lesser trochanter of femur (joining with iliacus @ hip)
A: - Flexion of trunk at waist
- flexion & lateral rotation of thigh at hip
Blends w/ iliacus at hip level for common insertion at lesser trochanter
Parallel fiber direction
Often bothered when sitting for too long
Deep Layer of Anterior Compartment of Leg
Extensor Hallicus Longus
L: Anterior leg deep
O: Fibula & interosseous membrane (middle & anterior surfaces)
I: Distal phalanx of hallux
A: Extension of hallux & dorsiflecion of foot at ankle
Only muscle in anterior leg compartment deep
Unipennate fiber direction
Superficial Anterior Compartment of Leg
Extensor Digitorum Longus
L: Anterior leg superficial
O: Lateral condyle of tibia, fibula and interosseous mebmbrane
I: Middle & distal phalanges of lateral 4 toes
A: Extension of lateral 4 toes and dorsiflexion of foot at ankle
Parallel fiber direction proximal 1/2 then unipennate fiber direction distal 1/2 (allows for dorsiflexion of foot @ankle)
Superficial Anterior Compartment of Leg
Tibialis Anterior
L: Anterior leg superficial
O: Lateral condyle & proximal 1/2 of tibia
I: Medial cuneiform & base of 1st metatarsal
A: Dorsiflexion & inversion of foot at ankle
Parallel fiber direction
- Largest ms in anterior leg compartment
- Part of the strirrup of foot
- Associated w/ shin splints (ms pulls from bone)
Deep Lateral Compartment of Leg
Fibularis (Peroneus) Brevis
L: Lateral leg deep
O: Distal 2/3 of fibula
I: Base of 5th metatarsal
A: Plantarflexion & eversion of foot at ankle
Posterior to lateral malleolus
Bipennate fiber direction
Superficial Lateral Compartment of Leg
Fibularis (Peroneus) Longus
L: Lateral leg superficial
O: Head & proximal 2/3 of fibula
I: Base of 1st metatarsal & medial cuneiform on plantar surface of foot
A: Plantarflexion & eversion of foot at ankle
- Posterior to lateral malleolus
- Part of stirrup of foot
Muscles of Pelvic Bowl
Name the two muscles of the pelvic bowl
- Iliacus
- Psoas major
Compartments of the Leg
How many compartments are there?
3 compartments
Compartments of the Leg
How many layers in the anterior compartment?
2
Compartments of the Leg
List the layers of the anterior compartment of the leg and the muscles they contain
Deep:
- Extensor hallucis longus
Superficial:
- Extensor digitorum longus
- Tibialis anterior
Compartments of the Leg
How many layers are in the lateral compartment of the leg?
2
Compartments of the Leg
List the layers of the lateral leg compartment and the muscles they contain
Deep:
- Fibularis brevis (peroneus)
Superficial:
- Fibularis longus (peroneus)
