Changes

===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 most commonly observed in Highland cattle, as pictured here]]

[[image: Horns.jpg|thumb|200px|right|Horns are commonly observed in Highland cattle, as pictured here]]