Vet Net: Veterinary Network

1. Simple hair follicle, 2. Compound hair follicle. (compound= have more than one hair in a follicle. Such as chinchillas have 60 hairs in one follicle)

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3. Glands of the skin

Endocrine gland： (excrete into blood directly)

Exocrine gland： (excrete into ducts )

- **unicellular glands (duct portion NOT branched)

- ****goblet cell

- **multicellular glands (duct portion BRANCHED)

****According to the shape of the secreting place: *:tubular (管狀)

*acinar (泡狀)

*tubuloacinar (管泡狀)

Secretion Methods:

Apocrine glands - a portion of the plasma membrane buds off the cell, containing the secretion.
Holocrine glands - the entire cell breaks down to secrete its substance.
Merocrine glands/ Eccrine - secrete their substances by exocytosis.

Sebaceous glands (exocrine, acinar)

-Scent organ

-Circumoral glands (嘴唇腺)

-Horn glands (角腺)

-Glands of Infraorbital pouch(下眼窩腺)

-Carpal glands (腕腺)

-Glands of Interdigital pouch (指間窩腺)

-Glands of the inguinal pouch (鼠蹊窩腺)

-Preputial glands (包皮腺)

-Tail glands (尾腺)

-Circumanal glands (肛門腺)

-Glands of anal sacs (肛門囊腺)

Sweat Glands

-Large (Apocrine) sweat gland頂漿汗腺

-Small (Eccrine) sweat gland外泌汗腺

Distribution of Mammary Glands:

1. Thoracic (upper part, before diaphragm)

2. Abdominal (middle part, after diaphragm)

3. Inguinal (lower part, after abdomen)

Examples: Thoracic--elephants, humans

Thoracoabdominal--cats

Thoracoinguinal--dogs

Inguinal--horse, goat, sheep, guinea pig, cattle

Milk Lines--a line of mammary glands (from arm pit to thighs) that can happen on all mammals. In case of abnormality, extra teats are likely to happen along the milk lines.