testis

n. (pl. testes) the principal male reproductive organ, a pair of which is normally located in the scrotum. The testes produce sperm in the seminiferous tubules (see spermatogenesis) and male sex hormones (androgens) in interstitial cells. See testicle. See also cryptorchidism; hypermobile testes.

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Psychology term of the day

November 18th 2024

tendon reflex

tendon reflex

the automatic contraction of a muscle elicited by stretching a tendon. Such reflexes are mediated by tendon stretch detectors, called Golgi tendon organs. An example of a tendon reflex is the patellar reflex, elicited by tapping or stretching the patellar tendon just below the kneecap. Also called deep reflex.