Torso

For other uses, see Trunk (disambiguation) and Torso (disambiguation).
Torso
Human male torso
Details
Identifiers
Latintruncus
Greekθύρσος (thúrsos)
MeSHD060726
TA98A01.1.00.013
A14.1.09.244
A14.2.03.003
TA2124
FMA7181
Anatomical terminology

The torso or trunk is an anatomical term for the central part, or the core, of the body of many animals (including human beings), from which the head, neck, limbs, tail and other appendages extend. The tetrapod torso — including that of a human — is usually divided into the thoracic segment (also known as the upper torso, where the forelimbs extend), the abdominal segment (also known as the "mid-section" or "midriff"), and the pelvic and perineal segments (sometimes known together with the abdomen as the lower torso, where the hindlimbs extend).[1]

Anatomy

Major organs

Surface projections of major organs of the torso, using the vertebral column and rib cage as main reference sources.

In humans, most critical organs, with the notable exception of the brain, are housed within the torso. In the upper chest, the heart and lungs are protected by the rib cage, and the abdomen contains most of the organs responsible for digestion: the stomach, which breaks down partially digested food via gastric acid; the liver, which respectively produces bile necessary for digestion; the large and small intestines, which extract nutrients from food; the anus, from which fecal wastes are egested; the rectum, which stores feces; the gallbladder, which stores and concentrates bile; the kidneys, which produce urine, the ureters, which pass it to the bladder for storage; and the urethra, which excretes urine and in a male passes sperm through the seminal vesicles. Finally, the pelvic region houses both the male and female reproductive organs.

Major muscle groups

The torso also harbours many of the main groups of muscles in the tetrapod body, including the pectoral, abdominal, lateral and epaxial muscles.

Nerve supply

The organs, muscles, and other contents of the torso are supplied by nerves, which mainly originate as nerve roots from the thoracic and lumbar parts of the spinal cord. Some organs also receive a nerve supply from the vagus nerve. The sensation to the skin is provided by the lateral and dorsal cutaneous branches.

  • Distribution of cutaneous nerves. Ventral aspect. Dorsal and lateral cutaneous branches labeled at center right.
    Distribution of cutaneous nerves. Ventral aspect. Dorsal and lateral cutaneous branches labeled at center right.
  • Dorsal aspect. Ventral and lateral cutaneous branches labeled at center right.
    Dorsal aspect. Ventral and lateral cutaneous branches labeled at center right.

See also

Wikimedia Commons has media related to Torsos.

References

  1. ^ "trunk" at Dorland's Medical Dictionary
Look up trunk in Wiktionary, the free dictionary.

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