Intermuscular septum
Septum intermusculare
Definition
An intermuscular septum is a sheet of deep fascia that extends inward from the investing fascia to attach to bone, separating muscles into functional compartments. Each septum provides surface area for muscle attachment and helps contain the spread of infection or fluid within a compartment.
The septa might extend into a muscle to split it into different parts, like the intermuscular septum of the erector spinae muscle.
References
Gray, H. (2016) Gray’s anatomy the anatomical basis of clinical practice. 41st edition. Edited by S. Standring. New York: Elsevier.