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Chapter

PEDS100 Chapter Notes -Metatarsal Bones, Cuneiform Bones, Navicular Bone


Department
Physical Education and Sport
Course Code
PEDS100
Professor
Gail Amort- Larson

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The Ankle and Foot 26 bones
-tarsus(ankle) contains 7 tarsal bones
~ 1/6 of weight comes through fibula, rest is directed through fibula
-Midline of foot is 2nd toe
-Talus: 2nd largest bone in foot, easily palpated. Primary tibial articulation is
between tibia and talus. (Medial malleolus of tibia, lateral malleolus of fibula, with
smooth superior trochlea of talus and medial and lateral extensions off talus.
Narrower at back.
-Calcaneus: (heel bone) easily palpated largest tarsal bone, easily palpated. most of
weight transferred from tibia to calcaneus to ground. Rough knob-shaped
posteriorly(attachment for calcanean tendon)
-Cuboid: easily palpated. articulates with anterior, lateral surface of calcaneus
-Navicular: (means boat) easily palpated. medial side of ankle, articulates with
anterior aspect of talus. Distal aspect of navicular articulates with three cuneiform
bones
-Cuneiform bones: three wedge-shaped bones in a row. Anterior to navicular.
Medial cuneiform, intermediate cuneiform(narrower than other 2 inferiorly forming
metatarsal arch), lateral cuneiform. Proximally articulate with navicular, lateral
cuneiform articulates with medial surface of cuboid
Metatarsal bones: form metatarsus(distal portion of foot) numbered 1-5 medially-
>laterally. First 3 metatarsal bones articulate with cuneiform bones, last 2 articulate
with cuboid.
Phalanges: same organization as phalanges of fingers. Hallux has two phalanges
Arches of the Foot
-formed by bony arrangements, provide “give” while walking and standing
-Medial arch formed by 1st metatarsal, 1st cuneiform, navicular, talus, calcaneus,
ligaments
-Lateral arch formed by calcaneus,lateral cuneiform, 5th metacarpal
-Longitudinal arch: medial and lateral arches. Ligaments/tendons tie calcaneus to
distal portions of metatarsal bones. Lateral side carries most of weight while
standing normally. Elasticity helps absorb shock
-Transverse arch: degree of curvature varies from lateral to medial borders.
-Flatfeet: fallen arches
Joints of Ankle and Foot
-Talocrural joint: (ankle joint) hinge joint formed by articulations between tibia and
fibula with talus. Allows limited dorsiflexion and plantar flexion
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