05/26/2026
๐๐ก๐ ๐๐ฎ๐ญ๐ญ๐๐ซ๐๐ฅ๐ฒ ๐๐จ๐ง๐โฆ
Deep within the horseโs skull sits a structure so central, so quietly influential, that once you truly see its roleโyou canโt unsee it.
The sphenoidโฆ often called โthe butterfly bone,โ a name linked to William Sutherlandโs early cranial osteopathic work in the early 1900s. A bone like a bridge between systems, relationships, and motion.
This is not just anatomy in isolation.
It is connection.
Hidden within the core of the skull, the sphenoid sits in relationship with nearly every cranial structure... articulating with 12 cranial bones... helping coordinate balance, symmetry, jaw function, and the subtle motion of the head as an integrated system.
Within its structure are many openings called foramina (small passageways that allow critical nerves and blood vessels to enter and exit). Among them is the pathway associated with the optic nerve, directly linking to vision itself. These are not incidental details; they are reminders of how densely interconnected this region is.
When a structure like the sphenoid moves, rotates, or is restricted, it is reasonable to appreciate that even subtle shifts in its relationships could influence the function of nearby neural and vascular pathways within the cranium.
And when you begin to appreciate thatโฆ something shifts.
Because the horse does not separate the skull from the body.
Or the jaw from the spine.
Or the teeth from the way the whole system organizes itself.
It is all communication.
The sphenoid becomes a key point in that conversation... its position and relationships influencing cranial alignment, TMJ balance, tongue and hyoid function, cervical posture, and the deeper patterns of tension and adaptation that travel beyond the head.
On its inferior surface sits a small, saddle-shaped depression called the sella turcica (Latin for โTurkish saddleโ). A remarkably fitting image in equine anatomy. This structure houses the pituitary gland, a central regulator of endocrine signaling.
The pituitary acts as a messenger interface between the brain and the rest of the body, helping regulate hormone production across multiple systems. In particular, the anterior pituitary releases adrenocorticotropic hormone (ACTH), which signals the adrenal glands to produce cortisol... a key hormone involved in metabolism, stress response, growth, and body composition.
This is where the โlightbulb momentโ happens.
When we realize that what presents as a localized issue (such as dental imbalance or asymmetry) may in fact be part of a wider network of cranial relationships, adaptive processes, and regulatory function.
Suddenly, the horse is no longer seen in pieces.
But as one continuous, intelligent, compensating whole.
And dentistry becomes something more than maintenance of enamel.
It becomes an opportunity to observe function.
To recognize compensation.
To understand how structure and system are constantly negotiating balance.
When the sphenoid is understood in this way, it changes how we look at the horse entirely.
Because sometimes the most important structures are not the ones you see firstโฆ
They are the ones everything else is listening to.
*Images taken from Google Images*