What are the three layers of tissue that compose the eyeball?
Topic Overview
- The outer layer of the eyeball is a tough, white, opaque membrane called the sclera (the white of the eye).
- The middle layer is the choroid.
- The inner layer is the retina, which lines the back two-thirds of the eyeball.
What are the three layers of breast tissue?
Sonographically, the breast is divided into three layers located between the skin and the pectoralis major muscle on the anterior of the chest wall. These layers are the subcutaneous layer, the mammary (glandular) layer, and the retromammary layer ( Figure 21-2 and Box 21-1 ).
Where is breast tissue located?
The breast tissue extends horizontally (side-to-side) from the edge of the sternum (the firm flat bone in the middle of the chest) out to the midaxillary line (the center of the axilla, or underarm). A tail of breast tissue called the “axillary tail of Spence” extend into the underarm area.
Is uvea same as choroid?
is that choroid is (anatomy) the vascular layer of the eye lying between the retina and the sclera while uvea is (anatomy) the middle of the three concentric layers that make up the eye; it is pigmented and vascular, and comprises the choroid, the ciliary body, and the iris.
What are the 4 layers of the eye?
The four layers of the sclera from external to internal are episclera, stroma, lamina fusca, endothelium. The episclera is the external surface of the sclera.
What is the first layer of your eye called?
cornea
The clear front of your eye is called the cornea. This transparent disc sits over the pupil and iris, protecting them and letting in light. It is highly sensitive. The cornea also forms the first part of the process of focusing what you look at into an image on the back of your eye (see below).
What are breast tissues?
Breast tissue is composed of milk glands, milk ducts and supportive tissue (dense breast tissue), and fatty tissue (nondense breast tissue). When viewed on a mammogram, women with dense breasts have more dense tissue than fatty tissue. On a mammogram, nondense breast tissue appears dark and transparent.
What is breast tissue made of?
Breasts are made up of lobules, ducts, and fatty and fibrous connective tissue. Lobules produce milk and are often called glandular tissue. Ducts are the tiny tubes that carry milk from the lobules to the nipple. Fibrous tissue and fat give breasts their size and shape and hold the other structures in place.
What are the parts of the breast?
The Parts of the Breast
- What Are Breasts Made Of?
- Nipple.
- Sulcus.
- Areola.
- Montgomery Glands.
- Lobes.
- Milk Ducts.
- Blood Vessels.
Is Pars Plicata part of uvea?
It is divided into two parts: a thicker body (pars plicata) anterior to a flatter body (pars plana). The pars plana of the ciliary body is then continuous with the most posterior component of uvea, the choroid. The choroid extends from termination of the pars plana at the ora serrata to the optic nerve.
What type of tissue is the eyelid made of?
Microscopically, this layer of the eyelid is made of epidermis and dermis. The epidermis has 6-7 layers of stratified squamous epithelium and the dermis is a layer of dense connective tissue. The dermis has elastic fibers, blood vessels, melanocytes, lymphatics, and nerves.
What is the outer layer of the eyeball called?
The outer layer of the eyeball is a tough, white, opaque membrane called the sclera (the white of the eye). The slight bulge in the sclera at the front of the eye is a clear, thin, dome-shaped tissue called the cornea. The middle layer is the choroid. The front of the choroid is the colored part of the eye called the iris.
What are the three main layers of the eye?
The eye has three main layers. These layers lie flat against each other and form the eyeball. The outer layer of the eyeball is a tough, white, opaque membrane called the sclera (the white of the eye). The slight bulge in the sclera at the front of the eye is a clear, thin, dome-shaped tissue called the cornea. The middle layer is the choroid.
What type of tissue is in a female breast?
Female breasts contain different types of fatty, fibrous, and glandular tissue: glandular tissue includes the breast lobes and breast ducts fibrous, or supportive or connective, tissue is the same tissue that ligaments and scar tissue are made of