Special Senses Imaging Quiz Developed by Sorcha Mc

Special Senses Imaging Quiz Developed by: Sorcha Mc. Caughley & Mark Brims Approved by: Gawain Hammond & Maureen Bain Supported by: The Chancellor’s Fund

Special Senses Imaging Quiz START! Developed by: Sorcha Mc. Caughley & Mark Brims Supported by: The Chancellor’s Fund

Special Senses • The Eye Q 1 • The Ear Q 2

The Eye Q 1 • (i) A makes up part of the Orbit. What is it? Canine – Zygomatic Arch – Zygomatic Process A Canine – Contrast showing duct in (ii). • (ii) Which of the fossae, foraminae and fissures in the Orbit is connected, via a duct, to the nasal cavity? – Ethmoidal Foraminae – Lacrimal Sac Fossa – Orbital Fissure

Correct • Yes! A is the Zygomatic Arch! • The Zygomatic Process is the incomplete Zygomatic Arch in horses and ruminants. • Try (ii)! • Choose a new question. Canine Zygomatic Arch Bovine Zygomatic Process

Incorrect • No, A is not the Zygomatic Process! • Remember: the Zygomatic Process is the incomplete Zygomatic Arch found in horses and ruminants. • Try again! • Choose a new question. Canine Zygomatic Arch Bovine Zygomatic Process

Correct • Yes! The Lacrimal Sac Fossa connects with the Nasolacrimal Duct! • Try The Ear Q 2! • Choose a new question. Nasolacrimal Duct

Incorrect • No, the Ethmoidal Foraminae do not connect with the nasal cavity. • Blood vessels and branches of the Ophthalmic nerve are found in the Ethmoidal Foraminae. • Try again! • Choose a new question.

Incorrect • No, the Orbital Fissure does not connect with the nasal cavity. • The Orbital Fissure carries nerves and the ophthalmic vein. • Try again! • Choose a new question.

• In this x-ray you can see the outline of the ear. • (i) Why is it not as white as the bones of the skull? The Ear Q 2 – Answer. • (ii) What is A? B – Tympanic Bulla – External Ear Cartilages – External Acoustic Meatus • (iii) What is B? A – Tympanic Bulla – External Ear Cartilages – External Acoustic Meatus

Answer • Normally, cartilage cannot be seen on an x-ray as it is softer and less dense than bone. • This x-ray would be described as ‘underexposed’. This means that the soft tissue structures are more visible. • Try (ii)! • Choose a new question.

Correct • Yes! A is the External Ear Cartilage! • It is not usually visible on x-rays as it is cartilage, not bone. • Try (iii)! • Choose a new question.

Incorrect • No, A is not the Tympanic Bulla. • The Tympanic Bullae are shown in this x-ray. Tympanic Bulla • Try again! • Choose a new question. Tympanic Bullae

Incorrect • No, A is not the External Acoustic Meatus. • The External Acoustic Meatus connects the External Ear to the Tympanic Bullae. • Try again! • Choose a new question.

Correct • Yes! B is the External Acoustic Meatus! • The outer part, nearest the external ear, is cartilagenous; it is rarely visible on x-rays. • The inner part, as it approaches the Tympanic Bulla, is osseus; it can sometimes be seen in x-rays. • Choose a new question. External Acoustic Meatus

Incorrect • No, B is not the External Ear Cartilage. • The External Ear Cartilages support the pinna of the Ear. • Try again! • Choose a new question. External Ear Cartilage

Incorrect • No, B is not the Tympanic Bulla. • The Tympanic Bulla is found at the end of the External Acoustic Meatus. • Try again! • Choose a new question. Tympanic Bullae