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THIGH MUSCLES: ANTERIOR COMPARTMENT

Sarcopterygian fish evolved muscles in their fins which move the fins.

LUNGFISH
The anterior compartment of the thigh in humans contains the sartorius and the quadriceps (rectus femoris, vastus medialis, vastus lateralis, and vastus intermedius).  In humans, the sartorius flexes the thigh, flexes the lower leg, and medially rotates the thigh.  While all of the quadriceps extend the knee, only the rectus femoris crosses the hip joint so it is the only one of the quadriceps which flexes the hip.  These muscles are typical of tetrapods.

FROG

FROG

FROG

SALAMANDER

SALAMANDER

TURTLE

TURTLE

TURTLE

ALLIGATOR

ANTERIOR THIGH MUSCLES

CHICKEN

ANTERIOR THIGH MUSCLES

ANTERIOR THIGH MUSCLES

PIGEON

PIGEONPIGEON

OPOSSUM

ANTERIOR THIGH MUSCLES

ANTERIOR THIGH MUSCLES
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CAT

ANTERIOR THIGH MUSCLES

ANTERIOR THIGH MUSCLES
ANTERIOR THIGH MUSCLES ANTERIOR THIGH MUSCLES
ANTERIOR THIGH MUSCLES ANTERIOR THIGH MUSCLES
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GOAT

ANTERIOR THIGH MUSCLES

ANTERIOR THIGH MUSCLES
ANTERIOR THIGH MUSCLES ANTERIOR THIGH MUSCLES

SHEEP

ANTERIOR THIGH MUSCLES

ANTERIOR THIGH MUSCLES
ANTERIOR THIGH MUSCLES ANTERIOR THIGH MUSCLES

COW

ANTERIOR THIGH MUSCLES

ANTERIOR THIGH MUSCLES

PIG

PIG

PIG

PIG

MONKEY

ANTERIOR THIGH MUSCLES

ANTERIOR THIGH MUSCLES
ANTERIOR THIGH MUSCLES

HUMAN MODEL

ANTERIOR THIGH MUSCLES

ANTERIOR THIGH MUSCLES
ANTERIOR THIGH MUSCLES ANTERIOR THIGH MUSCLES
ANTERIOR THIGH MUSCLES