Lower Limb

Overview of Foot Anatomy and Muscle Functions

General Organization of the Foot

  • The foot is organized into compartments.
  • Runners commonly heel strike due to contemporary shoe designs with thick heel pads.

Lateral Compartment

  • Contains two muscles referred to as "mumps" (likely a misinterpretation and should be muscles).
  • Fibula and foot anatomy are described as having a "very skinny" profile.
  • Important muscle:
    • Flexor Digitorum Longus:
    • Originates from the posterior tibia.
    • Tendon runs posterior to the medial malleolus.
  • Additionally mentioned:
    • Flexor Hallucis Longus:
    • Similar trajectory; runs posterior to the medial malleolus and ends medial to the foot.

Functions of Muscles on the Foot

  • Distinct functions for actions of the digits are emphasized.
  • Integration of contractions from multiple muscles can occur for combined effects on movement.

Deep Compartment of the Posterior Leg

  • Popliteus Muscle:
    • Noteworthy for being different from all previously learned muscles.
  • Gastrocnemius Muscle:
    • More prominent and visible, often mistaken for having more credit compared to Soleus.
    • Function: Primarily activated during forceful plantar flexion (more than just walking).
    • Crosses the knee joint; specifically mentioned that three muscles on the medial side of the ankle invert the foot.
    • Those muscles include:
    • Tibialis anterior
    • Other unspecified muscles on the lateral side include Fibularis longus and Fibularis tertius.

Muscles of the Dorsal Side of the Foot

  • Extensor Digitorum Brevis:
    • Responsible for extending the four little toes on the dorsal side of the foot.
  • Comparison made with Extensor Digitorum Longus from the anterior compartment, reinforcing that they are responsible for digit movement.

Plantar Foot Anatomy

  • The plantar (bottom) side of the foot contains four layers of muscles:
    • Layer numbering from 1 (most superficial) to 4 (deepest).
  • Practical consideration: It is difficult to dissect the bottom of the foot due to its thick skin, necessitating multiple scalpel blades.
  • After skin removal, one encounters subcutaneous layers containing muscles.
  • Encouragement for students to name these muscles and outline their actions prior to visuals being presented.
  • The relationship between the digital arm and foot anatomy mirrors that observed in the hand anatomy.

Functional Importance of Foot Muscles

  • The muscles of the foot function collectively to support the foot's arch.
  • Contraction of these muscles is essential in activities like:
    • Standing
    • Walking
    • Running
  • The continuous action helps prevent the arch from flattening.

Conclusion & Duties in Practical Sessions

  • Students are encouraged to engage with material concerning foot muscles through practical dissection to reinforce learning.
  • Advice to seek clarification after class on class materials and foot anatomy functions.