The laryngeal fat body

Abstract

To describe the anatomy and topography of the laryngeal fat body and of the space it lies within. The study is carried out on series of histological sections of head and neck blocks from six foetuses and three newborns. Three adult necks were dissected, a fourth one analysed through sagittal median section. CT-Scan and MRI imaging complete the description. The laryngeal fat body (LFB) lies within the pre-epiglottic (PE) space that stands in the median anterior part of the upper infrahyoid region, located just below the level of the hyoid bone. The walls of the PE space are: superior (base), anterior lateral right and left, posterior, inferior (apex). This space is divided into two compartments by a median septum. The LFB consists in a rather pure fat, structured in large polyhedral lobules. It shows no limiting capsule. Dissection-based description of the PE space made in literature matches ours conducted on series of histological sections. All authors agree on the fat content of the space but some of them find a capsule around the LFB that we did not observe on our histological sections. CT-Scan and MRI imaging are accurate for analysis of these structures and of similar efficiency. The study of the LFB should be considered regarding the one of other fat bodies in the human body. Anatomical knowledge of the PE space and its content, the LFB, is important, as alteration of their morphology is the early witness of neighbouring carcinological extension.