buttocks

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buttocks

 [but´oks]
the two fleshy prominences formed by the gluteal muscles on the lower part of the back. Called also breech, clunes, and nates.

but·tocks

(bŭt'oks), [TA] This word is grammatically plural.
The prominence formed by the gluteal muscles of either side.
Synonym(s): nates [TA], clunes ☆ , breech

buttocks

/but·tocks/ (but´oks) the two fleshy prominences formed by the gluteal muscles on the lower part of the back.

buttocks

the fleshy hillocks at the lower posterior part of the torso comprising fat and the gluteal muscles. Also called nates.

buttocks

A part of the back of the hip, which, in humans, forms one of the rounded protuberances on which a person sits; the rump.

Composition
Gluteus maximus and gluteus medius muscle covered by a variable layer of fat.

but·tocks

(bŭt'ŏks)
The two gluteal prominences.
Synonym(s): nates [TA] , breech, clunes.
Figure 1: Ascending nerve pathways and proprioceptive reflex arcs, represented in diagrammatic sections of the brain and spinal cord. Shown on the right: those serving the sensations listed. Shown on the left: reflex pathways for skeletal muscle control. (A) From a muscle spindle, to a synapse with an alpha motor neuron, and a branch to the brain. (B) From a tendon organ, inhibitory branch (broken line) to an alpha motor neuron, and a branch to the brain.

buttocks

these rounded projections are formed mainly by the three gluteal muscles. They arise from the surface of the ilium of the hip bone and cross the back of the hip joint to be inserted into the femur. The gluteus maximus, the largest, is crucial in the maintenance of the upright posture, as an extensor at the hips, and also in running, climbing and walking up steps. It also assists in keeping the leg straight at the knee, via a fibrous band attached to the tibia. The two smaller muscles (g. medius, g.minimus) mainly take part in abduction and rotation at the hip. Figure 1.

Patient discussion about buttocks

Q. I get shooting pains in my buttocks and both upper legs

A. Sounds like radicular pain (pain originating from injury to the roots of the nerves in the spinal column). Is it aggravated by coughing, straining, standing or sitting? Is it relieved by lying down.

You may read more here: http://www.nlm.nih.gov/medlineplus/backpain.html and http://www.nlm.nih.gov/medlineplus/backpain.html

More discussions about buttocks
References in periodicals archive ?
Based on our results and other studies, we can say that gluteal muscles paly an important role in increased frontal-plane motion of the knee when landing, increased knee valgus and tibia external rotation that have been identified as potential mechanisms of lower extremity dysfunction.
These ES shorts are made of partially elastic Lycra material containing flat embedded surface electrodes with built-in leads connected to the portable stimulator to noninvasively activate the gluteal muscles and hamstrings.
After depot aripiprazole is injected into the gluteal muscle, the active moiety slowly is released into circulation.
But a scan yesterday revealed a grade two tear in one of his gluteal muscles, and he has been pulled out of Delhi's 15-man squad on medical grounds.
But a scan on Monday revealed a grade two tear in one of his gluteal muscles, and he has been pulled out of Delhi's 15-man squad on medical grounds.
The scan showed a grade two tear in one of his gluteal muscles and he was subsequently pulled out of Delhi's 15-man squad.
The design works the gluteal muscles and helps strengthen the lower back, Foley said.
But a specialist in Edinburgh discovered his pain was linked to a problem with his gluteal muscles.
Posteriorly, the gluteal muscles and their fascia are attached, with innervation from the lumbosacral plexus via the gluteal nerves.
The gluteal muscles, the quadriceps, calves, anterior deltoids of the shoulders, and erector spinae are the most important drive phase muscles for acceleration.
However, Harkreader and Hogan (2004) recommended this site for adults and children over age 3 because these muscles are developed by walking; they did not endorse its use for infants and children under age 3 because the gluteal muscles are small and underdeveloped.
Children may consciously or unconsciously contract their pelvic and gluteal muscles when they feel the urge to defecate.