Leg bones and muscles Flashcards
Describe the shape of the tibial shaft?
Triangular in cross section
![](https://s3.amazonaws.com/brainscape-prod/system/cm/112/513/530/a_image_thumb.png?1659432864)
Describe the surfaces of the tibia, and the important features of each?
Medial, lateral and posterior surfaces
Medial surface is subcutaneous
Posterior surface - soleal line
![](https://s3.amazonaws.com/brainscape-prod/system/cm/112/513/777/a_image_thumb.png?1659432865)
What does the soleal line delineate?
Attachment of soleus and popliteus
Which muscular compartments are present in the leg?
What are their actions?
Anterior compartment: dorsiflex foot, extend toes
Posterior compartment: plantarflex foot, flex toes
Lateral compartment: evert foot
![](https://s3.amazonaws.com/brainscape-prod/system/cm/112/513/914/a_image_thumb.png?1659432865)
Describe the fascia that creates the three muscular compartments of the leg?
Deep fascia continuous with fascia lata - attached directly to tibia
Pair of intermuscular septa (anterior and posterior) arise from deep fascia to divide into three compartments
Interosseous membrane also contributes to divisions
![](https://s3.amazonaws.com/brainscape-prod/system/cm/112/513/956/a_image_thumb.png?1659432865)
Describe the arrangement of the muscle compartments in the leg?
Anterior
Lateral
Posterior (deep) - mirror of anterior
Posterior (deep)
![](https://s3.amazonaws.com/brainscape-prod/system/cm/112/514/082/a_image_thumb.png?1659432866)
List the muscles in the anterior compartment of the leg?
Tibialis anterior
EDL
EHL
(Fibularis tertius)
![](https://s3.amazonaws.com/brainscape-prod/system/cm/112/514/127/a_image_thumb.png?1659432866)
Describe the borders of the anterior compartment of the leg?
Between tibia, interosseous membrane, anterior intermuscular septum and deep fascia
![](https://s3.amazonaws.com/brainscape-prod/system/cm/112/514/154/a_image_thumb.png?1659432866)
Describe the actions of the muscles in the anterior compartment of the leg?
DORSIFLEXION AND EXTEND TOES
Tibialis anterior: dorsiflexion and inversion (on medial side of foot)
EDL: extends smaller toes
EHL: extends big toe
Why is tibialis anterior important in inversion?
Inserts on medial side of foot
(medial cuneifrom and base of first metatarsal)
![](https://s3.amazonaws.com/brainscape-prod/system/cm/112/514/223/a_image_thumb.png?1659432867)
Describe the insertion of tibialis anterior?
Medial cuneiform and base of first metatarsal
Describe the fibularis tertius muscle?
Spilts off from EDL
Small tendon
Inserts into base of fifth metatarsal
![](https://s3.amazonaws.com/brainscape-prod/system/cm/112/514/326/a_image_thumb.png?1659432867)
Describe the arrangement of muscles on the dorsum of the foot?
Run under extensor retinaculum
TIMOTHY HAS A NASTY DIRTY TOE
Medial to lateral: tibialis anterior, EHL, anterior tibial artery, deep fibular nerve, EDL, fibularis tertius
![](https://s3.amazonaws.com/brainscape-prod/system/cm/112/514/900/a_image_thumb.png?1659432867)
List the muscles in the lateral compartment of the leg?
Fibularis longus
Fibularis brevis
![](https://s3.amazonaws.com/brainscape-prod/system/cm/112/515/108/a_image_thumb.png?1659432868)
Describe the boundaries of the lateral compartment of the leg?
Between anterior and posterior septa, deep fascia and fibula
![](https://s3.amazonaws.com/brainscape-prod/system/cm/112/515/416/a_image_thumb.png?1659432870)