Bio 40a

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Define Origin

Origin is the point of attachment-it does not move when muscle shortens
Define Insertion

Insertion is the point of attachement- it moves towards the origin
Define Body or Belly

Body or Belly are the larger region of myscle between origin and insertion
Define Flexion

Flexion reduces angle of joints
Define Extention

Extension increases angle of joints
Define abduction

Abduction is Moving away from the body
Define Adduction

Adduction is bringing back to the body
Define rotation

Rotates bone around longitudinal axis, sucn as the neck, ankles, wrist, long axis of body
Define Dorsiflexion

Dorsiflexion is the movement towards the back, as in the foot moving upwards
Define Plantar flexion

Toes moving downwards toward the sole of foot
Define flexor muscle

decreases a joint angle
Define Extensor muscle

increases a joint angle
Define Abductor muscle

moves a bone away from the midline or away from body
Define adductor muscle

moves a bone closer to the midline of the body
Define external oblique

fibers run diagonally (at an agle) to the midline of the body
Define Rectus Abdominis

Fibers that run parallel to the midline
Define Maximus

Largest
Define tendon

Connective tissue that connects muscle to bones
Define ligament

Connects bone to bone
Define motor neuron

A neuron that conveys impulses from the central nervous system to a muscle
Define neuromuscular junction
- A neuromuscular junction is a place in the body where nerves meet a muscle