Monday, 27 July 2015

Flexor Digitorum Longus - of the "deep posterior compartment of the lower leg"

Remember last week where I introduced 'Tom, Dick, & Harry' ? A group of three muscles that live deep in "deep posterior compartment of the lower leg"? Deep meaning closest to the bone & posterior meaning on the back of the lower leg.
They work together to perform the same two muscle actions of the ankle :)

Today we'll talk about Flexor Digitorum Longus (aka 'Dick' of Tom, Dick & Harry)

Flexor: probably performs the action of 'flexion'
Digitorum: refers to our digits (aka fingers and toes!)
Longus: whenever a muscle is named Longus there is usually a similar, shorter 
version of this muscle nearby :)

Flexor Digitorum Longus Muscle Attachment Points:

ORIGIN:  middle 1/3 of the posterior tibia (aka "middle posterior surface" )
INSERTION: distal phalanges of toes 2-5

Flexor Digitorum Longus Muscle ACTIONS:

same two actions as Tom & Harry:

1- 'weak plantar flexion of the foot at the ankle joint

2 - inversion of the foot at the ankle joint:

*and because this muscles tendons extend all the way to the tips of toes 2-5 :

3- flexes toes 2-5 (all toes except big toe - #1)

And that's Dick!

Next week we'll meet Harry!