| basis cranii | The sloping floor of the cranial cavity. It comprises both the external base of skull (external view) and the internal base of skull (internal view). See: internal base of skull. Synonym: basis cranii, cranial base. (05 Mar 2000) |
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| basis cranii externa | An alternate term for external base of skull. (05 Mar 2000) |
| basis cranii interna | <anatomy> The interior aspect of the skull base on which the brain rests; the floor of the cranial cavity. See: base of skull. Synonym: basis cranii interna. (05 Mar 2000) |
| basis mandibulae | The rounded inferior border of the body of the mandible. Synonym: basis mandibulae. (05 Mar 2000) |
| basis modioli | The part of the modiolus enclosed by the basal turn of the cochlea; it faces the lateral end of the internal acoustic meatus. See: cochlear area. Synonym: basis modioli. (05 Mar 2000) |
| basis patellae | The superior border of the patella to which the tendon of the rectus femoris attaches. Synonym: basis patellae. (05 Mar 2000) |
| basis pedunculi | The base of the midbrain consisting of the crus cerebri and substantia nigra. See: cerebral peduncle. (05 Mar 2000) |
| basis phalangis | The expanded proximal end of each phalanx in the hand or foot that articulates with the head of the next proximal bone in the digit. Synonym: basis phalangis. (05 Mar 2000) |
| basis prostatae | The broad upper surface of the prostate contiguous with the bladder wall. Synonym: basis prostatae. (05 Mar 2000) |
| basis pulmonis | The lower concave part of the lung that rests upon the convexity of the diaphragm. Synonym: basis pulmonis. (05 Mar 2000) |
| basis pyramidis renis | The outer broad part of a renal pyramid that lies next to the cortex. Synonym: basis pyramidis renis. (05 Mar 2000) |
| basis stapedis | The flat portion of the stapes that fits in the oval window. Synonym: basis stapedis, footplate, foot-plate. (05 Mar 2000) |
| ala major ossis sphenoidalis | Strong squamous processes extending in a broad superolateral curve from the body of the sphenoid bone. The greater wing presents these suraces (facies): 1) cerebral surface: forms anterior third of the floor of the lateral portions of the middle cranial fossa; 2) temporal surface: forms the deepest portion of the temporal fossa; 3) infratemporal surface, forms the "roof" of the infratemporal fossa; 4) orbital surface: forms posterolateral wall of orbit. The greater wing forms the inferior border of the supraorbital fissure, and is perforated at its root by foramina rotundum ovale, and spinosum and the pterygoid canal. Synonym: ala major ossis sphenoidalis, ala temporalis. (05 Mar 2000) |
| ala minor ossis sphenoidalis | One of a bilateral pair of triangular, pointed plates extending laterally from the anterolateral body of the sphenoid bone. Forming the posteriormost portion of the floor of the anterior cranial fossa, their sharp posterior edge forms the sphenoidal ridge separating anterior and middle cranial fossae. The medial end of the lesser wing attaches to the body by means of two pedicles, thus forming the optic canal. The wing itself forms the superior margin of the supraorbital fissure. Synonym: ala minor ossis sphenoidalis, ala orbitalis, Ingrassia's apophysis, Ingrassia's wing. (05 Mar 2000) |
| ala ossis ilii | The upper flaring portion of the ilium. Synonym: ala ossis ilii. (05 Mar 2000) |