Human Movement Science & Functional Anatomy of the:

Biceps Femoris (Lateral Hamstring)

by Brent Brookbush DPT, PT, COMT, MS, PES, CES, CSCS, ACSM H/FS

Biceps Femoris by Gray's Anatomy - 20th Edition via

What’s in a name

  • biceps 1630s (adj.), from Latin biceps “having two parts,” literally “two-headed,” frombis“double” (see bis-) + -ceps comb. form of caput “head” (see capitulum). As a noun meaning “biceps muscle,” from 1640s, so called for its structure. Despite the -s, it is singular, and classicists insist there is no such word as bicep. (Etymology Online)
  • femur (n.) 1560s, from Latin femur “thigh, upper part of the thigh,” which is of unknown origin. (Etymology Online)

    • "Two headed muscles on the femur"

Cross-section of the Thigh (Note the Biceps Femoris at the bottom of the picture) -

Biceps Femoris

  • Origin:

    • Long Head: Distal part of the sacrotuberous ligament and posterior part of the tuberosity of the ischium sharing a common tendon with the semitendinosus (8, 11, 22).
    • Short Head: Lateral lip of the linea aspera, proximal 2/3 of the supracondylar line (along with the middle portion of the adductor magnus), and Lateral intermuscular septum (8, 11).

  • Insertion: The long head and short head of the biceps femoris share a common tendon that inserts on the lateral side of the head of the fibula, lateral condyle of the tibia, and deep fascia on the lateral side of the lower leg