- concave side of sperm head
The concave part of the late spermatid head or spermatozoon head that forms the ventral portion of the head, particularly in some rodent species.
- viral capsid, decoration
Component of the virus capsid (head), located on the outer head surface. Involved in the stabilization of the head structure and usually non-essential.
- anterior head segmentation
Partitioning the insect head anlage into procephalic (labral, (ocular), antennal and intercalary) segments. The procephalic segments lie anterior to the gnathal (posterior head) segments, and are pattered by different segmentation gene cascades to the abdominal, thoracic and posterior head (gnathal) segments.
- head morphogenesis
The process in which the anatomical structures of the head are generated and organized. The head is the anterior-most division of the body.
- head development
The biological process whose specific outcome is the progression of a head from an initial condition to its mature state. The head is the anterior-most division of the body.