Foot OINA Flashcards
Extensor Hallucis Longus
O: middle half of the anterior surface of the fibula and the interosseous membrane
I: base of the distal phalanx of the great toe
A: extends the metatarsophalangeal interphalangeal joints of the great toe; aids in DF
IN: deep fibular (peroneal) nerve
Extensor Hallucis Brevis
O: superolateral surface of the calcaneus
I: dorsum of base of proximal phalanx of the great toe
A: extends the great toe
IN: deep fibular (peroneal) nerve
Extensor Digitorum Longus
O: lateral condyle of the tibia, anterior surface of the fibula, lateral portion of the interosseous membrane
I: dorsum of the lateral 4 toes via extensor expansions (central slip inserts on base of middle phalanx, lateral slips on base of distal phalanx)
A: extends the metatarsophalangeal, proximal interphalangeal and distal interphalangeal joints of the lateral 4 toes; aids in DF
IN: deep fibular (peroneal) nerve
Flexor Hallucis Longus
O: lower 2/3 of the posterior surface of the fibula
I: base of the distal phalanx of the great toe
A: flexes the metatarsophalangeal and proximal interphalangeal joints of the great toe; plantar flexes the foot
IN: tibial nerve
Flexor Digitorum Longus
O: middle half of the posterior surface of the tibia
I: bases of the distal phalanges of digits 2-5
A: flexes the metatarsophalangeal, proximal interphalangeal and distal interphalangeal joints of digits 2-5; plantar flexes the foot
IN: tibial nerve
Flexor Digitorum Brevis
O: tuberosity of the calcaneus, plantar aponeurosis, intermuscular septae
I: base of the middle phalanx of digits 2-5 after splitting to allow passage of the flexor digitorum longus tendons
A: flexes the metatarsophalangeal and proximal interphalangeal joints of digits 2-5
IN: medial plantar nerve
Abductor Hallucis
O: medial side of the tuberosity of calcaneus
I: medial side of the base of the proximal phalanx of the great toe (hallux)
A: abducts the great toe; flexes the metatarsophalangeal joint
IN: medial plantar nerve
Abductor Digiti Minimi
O: medial and lateral sides of the tuberosity of the calcaneus
I: lateral side of the base of the proximal phalanx of the 5th digit
A: abducts the 5th toe; flexes the metatarsophalangeal joint
IN: lateral plantar nerve
Internal Intercostals
O: upper border of a rib
I: lower border of rib above, coursing up and medially
A: aids in exhalation by compressing ribs
IN: intercostal nerves (T1-T11)
External Intercostals
O: lower border of a rib within an intercostal space
I: upper border of the rib below coursing, downward and medially
A: aids in inhalation by raising ribs
IN: intercostal nerves (T1-T11)
Diaphragm
O: xiphoid process, costal margin, fascia over the quadratus lumborum and psoas major mm. (lateral and medial arcuate ligaments), vertebral bodies L1-L3
I: central tendon of the diaphragm
A: pushes the abdominal viscera inferiorly, increasing the volume of the thoracic cavity (inspiration)
IN: phrenic nerve (C3-C5)
Rectus Abdominus
O: pubis and the pubic symphysis
I: xiphoid process of the sternum and costal cartilages 5-7
A: flexes the trunk
IN: intercostal nerves 7-11 and subcostal nerve
Internal Oblique
O: thoracolumbar fascia, anterior 2/3 of the iliac crest, lateral 2/3 of the inguinal ligament
I: lower 3 or 4 ribs, linea alba, pubic crest
A: flexes and ipsilaterally bends the trunk, ipsilateral rotation
IN: intercostal nerves 7-11, subcostal, iliohypogastric and ilioinguinal nerves
External Oblique
O: lower 8 ribs
I: linea alba, pubic crest and tubercle, anterior superior iliac spine and anterior half of iliac crest
A: flexes and ipsilaterally bends the trunk; contralateral rotation
IN: intercostal nerves 7-11, subcostal, iliohypogastric and ilioinguinal nerves
Transversus Abdominus
O: lower 6 ribs, thoracolumbar fascia, anterior 3/4 of the iliac crest, lateral 1/3 of inguinal ligament
I: linea alba, pubic crest and pecten of the pubis
A: (flexes and laterally bends trunk) compresses viscera, supports abdominal tension; ipsilateral rotation
IN: intercostal nerves 7-11, subcostal, iliohypogastric and ilioinguinal nerves
