09/20/2025
🧩 𝗧𝗵𝗲 𝗠𝘆𝗼𝗱𝘂𝗿𝗮𝗹 𝗕𝗿𝗶𝗱𝗴𝗲 & 𝗶𝘁𝘀 𝗖𝗹𝗶𝗻𝗶𝗰𝗮𝗹 𝗜𝗺𝗽𝗼𝗿𝘁𝗮𝗻𝗰𝗲 𝗶𝗻 𝗛𝗼𝗿𝘀𝗲𝘀 🐎
An anatomical structure that is far more clinically relevant than many realise.‼️
🔍 𝗧𝗲𝗿𝗺𝗶𝗻𝗼𝗹𝗼𝗴𝘆:
Myo = muscle
Dural = dura mater, the protective membrane surrounding the spinal cord
This bridge represents a direct anatomical connection between the re**us capitis posterior minor muscle and the dura mater of the spinal cord, occurring in the spaces between the atlas (C1) and axis (C2), and between the atlas and the occiput.
Importantly, this region is one of the very few places in the body where the spinal cord is not fully protected by bone.
Alongside this muscular-dural connection, the greater occipital nerve (arising from the dorsal ramus of C1) traverses this region, making it particularly vulnerable to mechanical irritation, strain, or compression.
⚡ 𝗖𝗹𝗶𝗻𝗶𝗰𝗮𝗹 𝗶𝗺𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻𝘀:
Because of the proximity to the brainstem, dysfunction at the cranio-occipital (CO) junction and the myodural bridge can create widespread neurological consequences.
The brainstem governs essential autonomic and sensory functions — including auditory processing, swallowing, extraocular muscle control (vision), and muscle tone regulation.
⚠️ Chronic irritation here can therefore manifest as heightened hypersensitivity (sound sensitivity, light sensitivity, swallowing difficulties, abnormal muscle responses).
This partly explains why horses with poll trauma or pull-back injuries can present with long-term behavioural and physical signs that appear disproportionate to the initial event.
⚠️⛔️ PLEASE PLEASE TAKE NOTE
IF YOUR HORSE OR YOUR YOUNG HORSE PULLS BACK AND SHAKES THEIR HEAD IMMEDIATELY, get a qualified equine osteopath to see the horse within a week or 2 if possible.
Young horses 🐎 ❌️❌️ DO NOT TEACH TO TIE UP VIA A SOLID ANYTHING! ❌️❌️
💥 𝗖𝗹𝗶𝗻𝗶𝗰𝗮𝗹 𝗽𝗿𝗲𝘀𝗲𝗻𝘁𝗮𝘁𝗶𝗼𝗻𝘀 𝗜 𝗵𝗮𝘃𝗲 𝗼𝗯𝘀𝗲𝗿𝘃𝗲𝗱 𝗶𝗻 𝗽𝗿𝗮𝗰𝘁𝗶𝗰𝗲 𝗶𝗻𝗰𝗹𝘂𝗱𝗲:
𝘏𝘦𝘢𝘳𝘪𝘯𝘨 𝘢𝘯𝘥 𝘴𝘰𝘶𝘯𝘥 𝘳𝘦𝘢𝘤𝘵𝘪𝘷𝘪𝘵𝘺: horses that spook excessively or become intolerant to normal environmental noises after poll injury, likely due to altered brainstem auditory processing.
𝘖𝘤𝘶𝘭𝘢𝘳 𝘪𝘴𝘴𝘶𝘦𝘴: difficulty with tracking, changes in blink reflexes, or a horse appearing “head shy” around the eyes
𝘚𝘸𝘢𝘭𝘭𝘰𝘸𝘪𝘯𝘨 𝘢𝘯𝘥 𝘣𝘪𝘵 𝘢𝘤𝘤𝘦𝘱𝘵𝘢𝘯𝘤𝘦: horses that suddenly resist the bit, choke more easily, or develop tongue thrusting behaviours — often linked to brainstem-mediated swallowing reflex disruption.
𝘊𝘩𝘳𝘰𝘯𝘪𝘤 𝘵𝘦𝘯𝘴𝘪𝘰𝘯 𝘢𝘯𝘥 𝘨𝘶𝘢𝘳𝘥𝘪𝘯𝘨: persistent bracing of cervical and poll musculature, even at rest, due to ongoing nerve irritation.
𝘜𝘯𝘦𝘹𝘱𝘭𝘢𝘪𝘯𝘦𝘥 𝘣𝘦𝘩𝘢𝘷𝘪𝘰𝘶𝘳𝘢𝘭 𝘤𝘩𝘢𝘯𝘨𝘦𝘴: anxiety, head tossing, or hypersensitivity to light touch around the poll.
⚠️ 𝗣𝗿𝗮𝗰𝘁𝗶𝗰𝗮𝗹 𝗰𝗼𝗻𝘀𝗶𝗱𝗲𝗿𝗮𝘁𝗶𝗼𝗻𝘀:
This is precisely the region over which a halter or bridle headpiece lies. A single pull-back incident can cause profound trauma, not just to the soft tissues, but directly to the spinal cord and brainstem integration. These injuries often require years of careful management to recover, if at all. It also explains why palpation of the poll can elicit exaggerated responses — the tissue here is not just “muscular” but deeply neurological.
In practice, I have also observed training techniques in dressage where riders pursue the so-called “nuchal ligament flip.” This is not a desirable training adaptation — it is an induced strain on the nuchal ligament and supporting suboccipital musculature. Deliberately training a dysfunction in this region risks perpetuating cycles of instability, pain, and neurological irritation.
🚫 𝗞𝗲𝘆 𝘁𝗮𝗸𝗲𝗮𝘄𝗮𝘆:
Any disturbance of the CO junction and myodural bridge is not an isolated lesion. It can trigger an ongoing cycle of neurological stress, pain amplification, and compromised sensory integration — in other words, an unrelenting loop of agony.❗️
𝗙𝗼𝗿 𝘁𝗵𝗶𝘀 𝗿𝗲𝗮𝘀𝗼𝗻, 𝗜 𝘀𝘁𝗿𝗼𝗻𝗴𝗹𝘆 𝗮𝗱𝘃𝗶𝘀𝗲 𝗮𝗴𝗮𝗶𝗻𝘀𝘁 𝗵𝗮𝗿𝗱 𝘁𝘆𝗶𝗻𝗴 𝗮𝗻𝗱 𝗮𝗹𝗹 𝘁𝗿𝗮𝗶𝗻𝗶𝗻𝗴 𝗮𝗶𝗱𝘀.
𝗣𝗿𝗲𝘃𝗲𝗻𝘁𝗶𝗼𝗻 𝗶𝘀 𝘁𝗵𝗲 𝗯𝗲𝘀𝘁 𝗱𝗲𝗳𝗲𝗻𝘀𝗲 𝗮𝗴𝗮𝗶𝗻𝘀𝘁 𝗶𝗻𝗷𝘂𝗿𝘆 𝗶𝗻 𝘁𝗵𝗶𝘀 𝗿𝗲𝗴𝗶𝗼𝗻, 𝗮𝘀 𝘁𝗵𝗲 𝗰𝗼𝗻𝘀𝗲𝗾𝘂𝗲𝗻𝗰𝗲𝘀 𝗮𝗿𝗲 𝗻𝗼𝘁 𝗼𝗻𝗹𝘆 𝗺𝘂𝘀𝗰𝘂𝗹𝗼𝘀𝗸𝗲𝗹𝗲𝘁𝗮𝗹, 𝗯𝘂𝘁 𝗻𝗲𝘂𝗿𝗼𝗹𝗼𝗴𝗶𝗰𝗮𝗹 𝗮𝗻𝗱 𝘀𝘆𝘀𝘁𝗲𝗺𝗶𝗰.
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