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

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

Special Senses The Eye Q1 The Ear Q2

The Eye Q1 (i) A makes up part of the Orbit. What is it? – Zygomatic Arch Zygomatic Arch – Zygomatic Process Zygomatic Process (ii) Which of the fossae, foraminae and fissures in the Orbit is connected, via a duct, to the nasal cavity? – Ethmoidal Foraminae Ethmoidal Foraminae – Lacrimal Sac Fossa Lacrimal Sac Fossa – Orbital Fissure Orbital Fissure Canine A Canine – Contrast showing duct in (ii).

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 Zygomatic Process Bovine

 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 Zygomatic Process Bovine

Correct Yes! The Lacrimal Sac Fossa connects with the Nasolacrimal Duct! Try The Ear Q2! 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.

The Ear Q2 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? – Answer. Answer. (ii) What is A? – Tympanic Bulla Tympanic Bulla – External Ear Cartilages External Ear Cartilages – External Acoustic Meatus External Acoustic Meatus (iii) What is B? – Tympanic Bulla Tympanic Bulla – External Ear Cartilages External Ear Cartilages – External Acoustic Meatus External Acoustic Meatus A B

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 ‘under- exposed’. 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. Try again! Choose a new question. Tympanic Bulla 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 Bulla Tympanic Bullae