The lacrimal bone is the smallest and most fragile bone of the face; roughly the size of the little fingernail. It is situated at the front part of the medial wall of the orbit.It has two surfaces and four borders.Several bony landmarks of the lacrimal bone function in the process of lacrimation or crying.n early lobe-finned fishes and ancestral tetrapods, the lacrimal bone is a relatively large and robust bone, running from the orbit to the nostrils. It forms part of the side of the face, between the nasal bones and the maxilla.
Medical Definition of spinocerebellar. : of or relating to the spinal cord and cerebellum spinocerebellar degeneration.
spinocerebellar ataxia type 1 - caused by mutations in the ATXN1 gene. Spinocerebellar ataxia type 1 (SCA1) is a condition characterized by progressive problems with movement. SCA1 results from a mutation in the ATXN1 gene known as a trinucleotide repeat expansion.This mutation increases the length of the repeated CAG segment in the ATXN1 gene.ne region of the ATXN1 gene contains a DNA segment known as a CAG trinucleotide repeat. This segment is made up of a series of three DNA building blocks (cytosine, adenine, and guanine) that appear multiple times in a row. Normally, the CAG segment is repeated 4 to 39 times within the gene.