Pertinent Eyelid Anatomy

To understand the causes of and treatments for eyelid hollowness requires a working knowledge of eyelid anatomy. For a video introduction, watch

Anatomy for Blepharoplasty: A Crash Course (11 minutes).

Cross-Section Through Upper Eyelid

A	Eyeball	Front portion of eye
B	Skin	Epidermis on surface, dermis below
C	Orbicularis Muscle	Eyelid closing muscle
D	Tarsus (Tarsal Plate)	Stiffening element (like cartilage)
E	Orbital Septum	Layer holding back the orbital fat
F	Orbital Fat	Fat from the socket extending into lid
G	Inferior Oblique Muscle	Muscle moving the eyeball
H	Eyelid Retractors	Structures that help retract the lids
I	Orbital Bone	Bone surrounding the eye; socket
J	Conjunctiva	Lining of the back of eyelid and front of eye
K	Periosteum	Lining of the bone (called 'periorbita' in orbit)
L	Levator	Main upper lid opening muscle/tendon

Cross-Section Through Lower Eyelid

Additional diagrams can be found at eyelid and facial anatomy.

An in-depth narrative description can be found in the Insider's Guide to Blepharoplasty: Anatomy.