External ear

The outer ear (auris externa) is responsible for collecting sounds and presentation of information about them analyzers.

The auricle (concha auriculae) consists of elastic cartilage elastic ear (cartilago auriculae), coated with skin fold, which is firmly connected to the cartilage on the lateral surface and is movable on the inside. At the bottom of the ear cartilage changes in the fatty layer of tissue called a lobe or ear lobule (lo-bulus auriculae).

Free edge of the ear, curving slightly inward to form curl (helix), which comes from tip and runs along the entire edge of the ear, gradually thickening. Before the curl is a small groove, which extends upward and is called the rook (scapha). On the opposite side of the boat is anthelion (anthelix). He starts from another depression, which fades into the ear shell (concha auriculae) - external auditory canal. The side of the sink is located outside the ear hearing opening (porus acusticus externus), bounded on two sides by small cartilaginous projections: tragus (tragus) and protivokozelkom (antitragus). Here ends curl slightly curving downward and forming a leg curl (crus helicis). Some parts of the cartilage are connected with each other auricular muscles.

In Fig. 287.
Outer, middle and inner ear, frontal section
1 - curl;
2 - a hammer;
3 - anvil;
4 - the stirrup;
5 - the semicircular canals;
6 - a snail;
7 - the eve;
8 - external auditory canal;
9 - rook;
10 - inner ear;
11 - the middle ear (tympanic cavity);
12 - tympanic membrane;
13 - the outer ear;
14 - anthelion;
15 - Sink the ear;
16 - Ear cartilage;
17 - auditory tube;
18 - ear lobe

External auditory canal (meatus acusticus externus) is a curved tube length from 2.5 to 3, 5 cm, which ends at the tympanic membrane, separating the middle ear from him. It consists of two parts: the outer ear canal cartilage formed cartilage and connective tissue that connects it with an internal bony auditory meatus located in the temporal bone and the bone formed its substance. The inner surface of the ear canal is covered with skin containing hair follicles, sebaceous (glandulae sebaseae) and wax (glandulae ceruminosae) cancer. Last produce earwax.






List of Abbreviations

a., aa. — arteria, arteriae (artery, the artery)

lig., ligg. — ligamentum, ligamenta (ligament, the ligaments)

m., mm. — musculus, musculi (muscle, the muscle)

n., nn. — nervus, nervi (nerve, the nerve)

r., rr. — ramus, rami (branch)

s. — seu (or)

v., vv. — vena, venae (vienna)