Plate 16.309 Eyelid Ronald A. Bergman, Ph.D., Adel K. Afifi,
M.D., Paul M. Heidger, Peer Review Status: Externally Peer
Reviewed Rhesus monkey, 10% formalin, H. & E., 50 x. The eyelid
is a fold of skin; superficially, the keratinized epidermis
blends internally with a mucous membrane (the conjunctiva).
These layers are supported by a dermal core of connective tissue
in which striated and smooth muscle, glands, and hair follicles
are located. Eyelash follicle: A row of short stout hairs are
found at the free margin of the lid. Penetrate deep into the
dermis. Their follicles are similar to those found elsewhere in
the body but lack the arrector pili smooth muscle. Skin: Thin
layer of epidermis continuous with the conjunctiva. Fat lobule:
Scattered in the connective tissue core of the eyelid. Orbicular
muscle: Skeletal muscle bundles that lower the eyelids.
Conjunctiva: Mucous membrane lining the inside of the eyelid.
The epithelium is stratified columnar with goblet cells
scattered among the superficial cells.