ASTRAGAL, ASTRAGALUS, in Anatomy, a Bone of the Heel, having a convex Head, articulated with the two Facils of the Leg, by Ginglymus. See LEG and FOOT.
The Astragalus called Talus, and Os Calcis, is the first Bone of the Tarsus. See TALUS and TARSUS.
Some also apply the Name to the Vertebrae of the Neck.—Homer, in his Odyssey, uses the Term on this Occasion. See VERTEBRAE.
The Astragalus called Talus, and Os Calcis, is the first Bone of the Tarsus. See TALUS and TARSUS.
Some also apply the Name to the Vertebrae of the Neck.—Homer, in his Odyssey, uses the Term on this Occasion. See VERTEBRAE.
AURICLE, Auricula, in Anatomy, the external Ear; or that Part of the Ear which is prominent from the Head. See EAR. The Word is a diminutive of Auris, Ear; q. d. little Ear. For the Structure and Variety in the Auricle; with the several Parts thereof, their Names, etc. see EAR. Auricle is also applied to two Appendages of the Heart; being two muscular Caps, covering the two Ventricles thereof. See VENTRICLE. They move regularly like the Heart; only in an inverted Order; their Systole corresponding to the Diastole of the Heart and vice versa. See further of their Structure and Office under the Article HEART. See also SYSTOLE and DIASTOLE, etc.
AXILLA, or ARMPIT, in anatomy, the cavity under the upper part of the arm; commonly the armpit. See ARM.
The Word is a diminutive of Axis; q.d. little Axis.
AXILLA, abscesses in the axilla are usually dangerous, on account of the many blood-vessels, lymphatics, nerves, etc. thereabout, which form large plexus’s. See ULCER. By the ancient laws, criminals were to be hanged by the axilla, if they were under the age of puberty. See HANGING, PUBERTY, etc.
The Word is a diminutive of Axis; q.d. little Axis.
AXILLA, abscesses in the axilla are usually dangerous, on account of the many blood-vessels, lymphatics, nerves, etc. thereabout, which form large plexus’s. See ULCER. By the ancient laws, criminals were to be hanged by the axilla, if they were under the age of puberty. See HANGING, PUBERTY, etc.
AXILLARY, axillaris, in anatomy, something that belongs to the axilla, or lies near them. See AXILLA. Axillary vein is one of the subclavian veins; which passing under the arm-pits, divides itself into several other veins. See SUBCLAVIAN and VEIN. Axillary artery is a remainder of the trunk of the subclavian artery; which passing under the arm-pits, changes its name, and is called axillary. See ARTERY. The second vertebra of the back is also called axillary; in regard it is the nearest to the arm-pits. See AXIS and VERTEBRA.
AZYGOS, in anatomy, a vein otherwise called vena sine pari, because single. See VEIN. The vena azygos is the third branch of the ascending trunk of the cava.—It descends through the right side of the cavity of the thorax, and at its arrival at the eighth or ninth vertebra, begins to keep the middle, and sends forth on each side, intercostal branches to the interstices of the eight lower ribs; and there is divided into two branches, the larger of which is inserted sometimes into the cava, but oftener into the emulgent: The other enters the cava, commonly a little below the emulgent, but is seldom joined to the emulgent itself. See CAVA and EMULGENT.
