Equine Anatomy

Introduction

  • Discussed the importance of the equine head in veterinary practice.

  • Used various cases as examples to illustrate key points.

Equine Head Anatomy

Lacerations and Professional Examinations

  • Emphasized the frequency of lacerations in equine; horses tend to get injuries due to their behavior.

  • Importance of knowing how to conduct exams related to head injuries.

Bones of the Equine Head

  • Discussed several bones including:

    • Intra cortical

    • Nasal

    • Incisive

    • Mandibular notch

Foramina

  • Noted three critical foramina:

    • Interorbital foramen

    • Mental foramen

    • Mandibular foramen

Nerve Blocks in Veterinary Practice

Importance of Nerve Blocks

  • Introduced the importance of nerve blocks concerning equine ocular health.

  • Stressed that these nerve blocks are now common in veterinary medicine.

Types of Nerve Blocks for Equine Eyes

  • Identified five primary nerve blocks for the eye:

    1. Supraorbital - located above the eye.

    2. Auriculopalpebral - specifically focused on eye comfort.

    3. Lacrimal

    4. Zygomatic facial

    5. Infra-trochlear

  • All blocks, except auriculopalpebral, are branches of the trigeminal nerve.

Technique for Nerve Blocks

  • Reinforced that all nerve blocks for the eye must be preceded by auriculopalpebral block to prevent blinking (blepharospasm).

Clinical Applications

  • Explained that these nerve blocks can be used effectively in various cases, such as:

    1. Eye lacerations

    2. Abscess removal

    3. Tumor excision

Eye Exam Techniques

Common Procedures

  • Importance of using ultrasound to determine causes of edema or swelling around eyelids.

  • Recognized lacerations and corneal ulcers as other major issues veterinarians encounter.

Diagnosis Methods

  • Utilization of fluorescein staining to assess cornea integrity involves:

    • Application to detect corneal erosion indicated by green stain.

Subpalpebral Lavage System

  • Described the insertion of a subpalpebral lavage system to facilitate medication delivery to the eye without additional stress on the horse.

    • System consists of two tiny tubes inserted along the eyelids allowing for multiple doses of medication.

Equine Sinus and Nasal Anatomy

Overview of Nasal Structures

  • Discussed the fundamental divisions of the nostrils:

    • Dorsal Part: False or diverticulum (blind nostril).

    • Ventral Part: True nostril.

Clinical Importance of Nasal Passage

  • Importance during procedures such as nasogastric tube passing and endoscopy; blocking the false nostril can ensure successful passage into the true nostril.

Caution in Procedures

  • Highlighted caution needed to avoid injuring the highly vascularized ethmoid concha which can lead to severe bleeding.

Sinus Anatomy

Functions of Air-Filled Sinuses

  • Air-filled sinuses serve to decrease the weight of a horse's head, create dental spaces, and assist with balance.

  • Identified three major sinuses:

    1. Conchofrontal sinus

    2. Maxillary sinus

    3. Sphenopalatine sinus

Sinusitis and Affected Age Group

  • Sinusitis is a common clinical condition noted, especially significant in horses less than two years due to non-closed bone plate which could lead infections spreading to the brain.

Symptoms of Sinusitis

  • Head shakes and drainage sounds serve as indicators of potential sinusitis; it is imperative to differentiate clinical noises as expiratory observed during respiration.

Guttural Pouches

Overview and Function

  • Guttural pouches are described as air-filled extensions of the ear canal, separated by a thin membrane with crucial functions:

    • Help lessen head weight.

    • Aid in the horse's balance.

    • Serve as a cooling mechanism for blood directed toward the brain.

Clinical Relevance

  • Conditions affecting guttural pouches include:

    • Tympany (air accumulation)

    • Empyema (pus accumulation)

    • Mycosis (fungal infection)

Surgical Access and Techniques

  • Discussed the surgical access to the guttural pouches through various techniques, including:

    • Perpendicular Penetration

    • Bone Flap

Inferring Conditions from Guttural Pouch Inflammation

  • Noted the risk of serious conditions like strangles, which includes lymph node enlargement and infection that can spread to the brain.

Conclusion

Key Takeaway Points

  • Core importance of anatomical knowledge for surgical approaches and recognizing signs of disease.

  • Reinforcement of key anatomical landmarks in diagnosing and treating equine ailments to ensure effective clinical practice.