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Horn - Anatomy & Physiology (view source)
Revision as of 13:10, 10 September 2010
, 13:10, 10 September 2010Text replace - "Paranasal sinuses - Anatomy & Physiology|" to "Paranasal Sinuses - Anatomy & Physiology|"
===Horns===
===Horns===
Horns have a central, conical bony core or '''corunal process''' that grows out from the [[Skull and Facial Muscles - Anatomy & Physiology#Frontal Bone|frontal bone]] of the skull. After 6 months of age, the bone becomes hollow and the space within it is continuous with the [[Paranasal sinuses - Anatomy & Physiology|frontal sinuses]]. The surface of the bone is ridged and porous and is covered with papillated [[Skin - Anatomy & Physiology#dermis|dermis]] that is continuous with the periosteum and [[Skin - Anatomy & Physiology#epidermis|epidermis]] which keratinises and forms the protective covering of the horn. The substance of the horn is similar to that of the [[Hoof - Anatomy & Physiology|hoof]] and is a mixture of tubules and intertubular horn. The new horn produced at the base is soft and often transparent and resembles the [[Hoof - Anatomy & Physiology|periople]] of the hoof, giving the horn a glossy appearance.
Horns have a central, conical bony core or '''corunal process''' that grows out from the [[Skull and Facial Muscles - Anatomy & Physiology#Frontal Bone|frontal bone]] of the skull. After 6 months of age, the bone becomes hollow and the space within it is continuous with the [[Paranasal Sinuses - Anatomy & Physiology|frontal sinuses]]. The surface of the bone is ridged and porous and is covered with papillated [[Skin - Anatomy & Physiology#dermis|dermis]] that is continuous with the periosteum and [[Skin - Anatomy & Physiology#epidermis|epidermis]] which keratinises and forms the protective covering of the horn. The substance of the horn is similar to that of the [[Hoof - Anatomy & Physiology|hoof]] and is a mixture of tubules and intertubular horn. The new horn produced at the base is soft and often transparent and resembles the [[Hoof - Anatomy & Physiology|periople]] of the hoof, giving the horn a glossy appearance.
[[image: Horns.jpg|thumb|200px|right|Horns are commonly observed in Highland cattle, as pictured here]]
[[image: Horns.jpg|thumb|200px|right|Horns are commonly observed in Highland cattle, as pictured here]]