| A&BC | air and bone conduction |
|---|---|
| ABM | adjusted body mass; alveolar basement membrane; autologous bone marrow |
| ABMI | autologous bone marrow transplantation |
| ABMT | American Board of Medical Toxicology; autologous bone marrow transplantation |
| AC/BC | air conduction/bone conduction [time ratio] |
| frontal lobe of cerebrum | The portion of each cerebral hemisphere anterior to the central sulcus. Synonym: lobus frontalis cerebri, frontal lobe. (05 Mar 2000) |
|---|---|
| frontal margin | Edge of a bone which articulates with the frontal bone. See: frontal border of parietal bone, frontal border of sphenoid bone. Synonym: margo frontalis, frontal margin. (05 Mar 2000) |
| frontal nerve | <anatomy, nerve> A branch of the ophthalmic nerve which divides within the orbit into the supratrochlear and the supraorbital nerves. Synonym: nervus frontalis. (05 Mar 2000) |
| frontal notch | A small notch, sometimes a foramen, on the orbital margin of the frontal bone medial to the supraorbital notch. Synonym: incisura frontalis. (05 Mar 2000) |
| frontal part of corpus callosum | Frontal radiation of the corpus callosum; that part of the fibre radiation of the corpus callosum which bends forward toward the frontal pole of the cerebrum. Synonym: forceps minor, forceps anterior, frontal part of corpus callosum, pars frontalis corporis callosi. (05 Mar 2000) |
| frontal plane | A vertical plane at right angles to a sagittal plane, dividing the body into anterior and posterior portions. Synonym: frontal plane. (05 Mar 2000) |
| frontal plate | In the foetus, a cartilage plate between the lateral parts of ethmoid cartilage and the developing sphenoid bone. (05 Mar 2000) |
| frontal pole | The most anterior promontory of each cerebral hemisphere. Synonym: polus frontalis cerebri, frontal pole. (05 Mar 2000) |
| frontal pole of cerebrum | The most anterior promontory of each cerebral hemisphere. Synonym: polus frontalis cerebri, frontal pole. (05 Mar 2000) |
| frontal process of maxilla | The upward extension from the body of the maxilla, which articulates with the frontal bone. Synonym: nasal process, processus frontalis maxillae. (05 Mar 2000) |
| frontal region of head | The surface region of the head corresponding to the outlines of the frontal bone. Synonym: regio frontalis capitis. (05 Mar 2000) |
| frontal section | A cross section attained by slicing, actually or through imaging techniques, the body or any part of the body or any anatomic structure in the coronal or frontal plane, i.e., in a vertical plane perpendicular to the median or sagittal plane. Since actual sectioning in the coronal plane results in an anterior and a posterior portion, an anatomical coronal section may be a two-dimensional view of the cut surface of the posterior aspect of the anterior portion, or of the anterior aspect of the posterior portion. Synonym: frontal section. (05 Mar 2000) |
| frontal sinus | One of the paired, but seldom symmetrical, air spaces located between the inner and outer compact layers of the frontal bone. (12 Dec 1998) |
| frontal sinus aperture | One of a pair of openings in the floor of the frontal sinuses in the nasal part of the frontal bone, through which the frontal sinuses communicate with the ethmoidal infundibulum via the frontonasal duct. Synonym: apertura sinus frontalis. (05 Mar 2000) |
| frontal sinusitis | Inflammation of the frontal sinus; in most cases the infection is caused by the bacteria streptococcus pneumoniae and haemophilus influenzae. This condition may be acute or chronic. (12 Dec 1998) |