| pars atlantica | See: vertebral artery. (05 Mar 2000) |
|---|---|
| pars autonomica | <anatomy> Neurons that are not under conscious control, comprising two antagonistic components, the sympathetic and parasympathetic nervous systems. The autonomic nervous system regulates key functions including the activity of the cardiac (heart) muscle, smooth muscles (e.g., of the gut), and glands. The autonomic nervous system has two divisions: 1. The sympathetic nervous system that accelerates the heart rate, constricts blood vessels, and raises blood pressure. 2. The parasympathetic nervous system slows the heart rate, increases intestinal and gland activity, and relaxes sphincter muscles. (03 Jul 1999) |
| pars basalis arteriae pulmonalis | See: right pulmonary artery, left pulmonary artery. (05 Mar 2000) |
| pars basilaris ossis occipitalis | The part of the occipital bone that lies anterior to the foramen magnum and joins with the body of the sphenoid bone. Synonym: pars basilaris ossis occipitalis, basal part of occipital bone, basilar apophysis, basilar process of occipital bone, basilar process, basiocciput. (05 Mar 2000) |
| pars basilaris pontis | The large ventral part of the pons occupied by the nuclei pontis, traversed longitudinally by corticopontine, corticobulbar, and corticospinal fibres, and transversely by pontocerebellar fibres. Pontocerebellar fibres converging laterally form the middle cerebellar peduncle or brachium pontis. Synonym: pars ventralis pontis, anterior part of pons, basilar part of pons, pars basilaris pontis. (05 Mar 2000) |
| pars buccopharyngea musculi constrictoris pharyngei superioris | See: superior constrictor muscle of pharynx. Synonym: pars buccopharyngea musculi constrictoris pharyngei superioris. (05 Mar 2000) |
| pars cardiaca gastris | The area of the stomach close to the oesophageal opening (cardiac orifice or cardia) which contains the cardiac glands. Synonym: pars cardiaca gastris, pars cardiaca ventriculi, cardia, gastric cardia. (05 Mar 2000) |
| pars cartilaginea septi nasi | A thin cartilaginous plate located between vomer, perpendicular plate of the ethmoid, and nasal bones, and completing the nasal septum anteriorly. Synonym: cartilago septi nasi, cartilage of nasal septum, cartilaginous septum, pars cartilaginea septi nasi, quadrangular cartilage, septal cartilage. (05 Mar 2000) |
| pars cartilaginea tubae auditivae | Synonym: cartilaginous part of auditory tube. (05 Mar 2000) |
| pars cartilaginosa systematis skeletalis | The part of the skeleton composed of cartilage. Synonym: pars cartilaginosa systematis skeletalis. (05 Mar 2000) |
| pars cavernosa | The portion of the male urethra, about 15 cm in length, which traverses the corpus spongiosum. Synonym: pars spongiosa urethrae masculinae, pars cavernosa, penile urethra, spongy part of the male urethra. (05 Mar 2000) |
| pars cavernosa arteriae carotidis internae | <anatomy, artery> The tortuous portion of the internal carotid artery located within the cavernous sinus; it has numerous small branches. Synonym: pars cavernosa arteriae carotidis internae. (05 Mar 2000) |
| pars ceca retinae | The embryological anterior part of the retina that evolves into the pars ciliaris retinae and pars iridica retinae. (05 Mar 2000) |
| pars centralis | <anatomy, neurology> Pertaining to the brain, cranial nerves and spinal cord. It does not include muscles or peripheral nerves. In invertebrates, the central nervous system is composed of the segmental ganglia of the ventral nerve cord together with the fused ganglia or brain at the anterior end. Acronym: CNS (12 Jan 1998) |
| pars ceratopharyngea musculi constrictoris pharyngis medii | See: middle constrictor muscle of pharynx. Synonym: pars ceratopharyngea musculi constrictoris pharyngis medii. (05 Mar 2000) |