Changes

The '''ventral sinus system''' contains the '''cavernous sinuses''', '''basilar sinus''', and '''ventral petrosal sinus'''. The cavernous sinuses lie on either side of the [[Equine Endocrine System - Horse Anatomy#Pituitary Gland|pituitary gland]] on the floor of the cranial vault.  They are joined across the midline by the cranial and caudal intercavernous sinuses to encircle the [[Equine Endocrine System - Horse Anatomy#Pituitary Gland|pituitary gland]] . This circle of sinuses around the [[Equine Endocrine System - Horse Anatomy#Pituitary Gland|pituitary gland]]  has connections through the '''orbital fissure''', the '''optic foramen''', and the '''oval foramen''' to peripheral veins. The internal carotid artery lies within this sinus system in the horse.  Caudally, the cavernous system

The '''ventral sinus system''' contains the '''cavernous sinuses''', '''basilar sinus''', and '''ventral petrosal sinus'''. The cavernous sinuses lie on either side of the [[Equine Endocrine System - Horse Anatomy#Pituitary Gland|pituitary gland]] on the floor of the cranial vault.  They are joined across the midline by the cranial and caudal intercavernous sinuses to encircle the [[Equine Endocrine System - Horse Anatomy#Pituitary Gland|pituitary gland]] . This circle of sinuses around the [[Equine Endocrine System - Horse Anatomy#Pituitary Gland|pituitary gland]]  has connections through the '''orbital fissure''', the '''optic foramen''', and the '''oval foramen''' to peripheral veins. The internal carotid artery lies within this sinus system in the horse.  Caudally, the cavernous system

communicates with the '''basilar sinus''', which lies on the floor of the occipital bone, and the '''ventral petrosal sinus''', which lies within the [[Equine Meninges - Horse Anatomy#Dura Mater|dura mater]] in the caudal part of the cranial vault. The '''ventral petrosal sinus''' exits the '''foramen lacerum''' or '''jugular foramen''' to become continuous with the '''jugular vein'''.

communicates with the '''basilar sinus''', which lies on the floor of the occipital bone, and the '''ventral petrosal sinus''', which lies within the [[Equine Meninges - Horse Anatomy#Dura Mater|dura mater]] in the caudal part of the cranial vault. The '''ventral petrosal sinus''' exits the '''foramen lacerum''' or '''jugular foramen''' to become continuous with the '''jugular vein'''.