A muscle whose contraction extends or straightens a limb or other part of the body.Often contrasted with flexor
- ‘The limb is supplied with a single extensor muscle and a single flexor, all other joints are considered rigid, and the objective of the CNS is to maintain the position of the limb.’
- ‘The anterior compartment flexor muscles of the arm are innervated by the musculocutaneous nerve, and the large posterior compartment extensor muscle is innervated by the radial nerve.’
- ‘To offset well-established volume/area relationships limiting muscle force, larger animals walk on extended limbs and show allometric increases in extensor muscle lever arm lengths.’
- ‘Flexion force applied against long finger (third digit) extension distal to the proximal interphalangeal joint may provoke pain over the extensor muscle mass in the proximal forearm.’
- ‘Then, when you've completed the movement, the flexor relaxes and the extensor contracts to extend or straighten the limb at the same joint.’
Early 18th century: from late Latin, from extens- stretched out from the verb extendere (see extend).
We take a look at several popular, though confusing, punctuation marks.