| occipital groove | A narrow groove medial to the mastoid notch of the temporal bone that lodges the occipital artery. Synonym: sulcus arteriae occipitalis, sulcus of occipital artery. (05 Mar 2000) |
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| olfactory groove | The sagittal sulcus on the inferior or orbital surface of each frontal lobe of the cerebrum, demarcating the straight gyrus from the orbital gyri, and covered on the orbital surface by the olfactory bulb and tract. Synonym: sulcus olfactorius, olfactory groove. (05 Mar 2000) |
| optic groove | The groove on the upper surface of the sphenoid bone running transversely between the optic canals bounded anteriorly by the sphenoidal limbus and posteriorly by the tuberculum sellae; forms in relationship to the optic chiasm. Synonym: sulcus prechiasmatis, chiasmatic sulcus, optic groove, prechiasmatic sulcus. (05 Mar 2000) |
| tracheobronchial groove | The depression in the floor of the caudal end of the pharynx, continued downward on the ventral wall of the foregut; from it are developed the lower part of the larynx and the trachea, bronchi, and lungs. Synonym: tracheobronchial groove. (05 Mar 2000) |
| transverse anthelicine groove | A deep groove on the cranial surface of the auricle separating the eminences of the triangular fossa and of the concha. Synonym: sulcus anthelicis transversus. (05 Mar 2000) |
| transverse nasal groove | A single deep horizontal groove at the level of the alae, with no associated defects. Synonym: transverse nasal groove. (05 Mar 2000) |
| ethmoidal groove | A groove on the inner surface of each nasal bone, lodging the external nasal branch of the anterior ethmoid nerve. Synonym: sulcus ethmoidalis. (05 Mar 2000) |
| tympanic groove | The sulcus on the inner aspect of the tympanic part of the temporal bone in which the tympanic membrane is fixed. Synonym: sulcus tympanicus. (05 Mar 2000) |
| urethral groove | The groove on the ventral surface of the embryonic penis which ultimately is closed to form the penile portion of the urethra. (05 Mar 2000) |
| lacrimal groove | The groove in the nasal surface of the maxilla which, together with the lacrimal bone, forms the fossa for the lacrimal sac. Synonym: sulcus lacrimalis. (05 Mar 2000) |
| laryngotracheal groove | The depression in the floor of the caudal end of the pharynx, continued downward on the ventral wall of the foregut; from it are developed the lower part of the larynx and the trachea, bronchi, and lungs. Synonym: tracheobronchial groove. (05 Mar 2000) |
| lateral bicipital groove | at the cubital fossa, the groove separating the biceps brachii and brachialis muscles on the lateral side. Synonym: sulcus bicipitalis lateralis. (05 Mar 2000) |
| linguogingival groove | A groove separating the embryonic mandibular portion of the tongue from the remainder of the mandibular process. (05 Mar 2000) |
| Lucas' groove | A faint groove occasionally caused by the chorda tympani nerve on the spine of the sphenoid. Synonym: Lucas' groove, sulcus spinosus. (05 Mar 2000) |