| 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) |
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| 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) |