QCM : Embryology and Anatomy of Development — 24 questions

Questions et réponses du QCM

1. Which sequence correctly describes the afferent visual pathway from the retina to the visual cortex?

Retina → optic nerve → optic chiasm → optic tract → lateral geniculate nucleus → optic radiation → occipital cortex
Retina → optic chiasm → optic nerve → optic tract → optic radiation → occipital cortex
Retina → optic nerve → lateral geniculate nucleus → optic chiasm → optic tract → occipital cortex
Retina → optic tract → optic nerve → optic chiasm → lateral geniculate nucleus → occipital cortex

Retina → optic nerve → optic chiasm → optic tract → lateral geniculate nucleus → optic radiation → occipital cortex

Explication

Visual information travels from the retina through the optic nerve, chiasm, and tract to the lateral geniculate nucleus, then via optic radiation to the occipital cortex. The other options place these structures in the wrong order.

2. Which nutrient source is provided by uterine gland secretion before full placental exchange is established?

Histotrophe
Embryotrophe
Haemotrophe
Amniotrophe

Histotrophe

Explication

Histotrophe is uterine-gland secretion that initially nourishes the embryo in the uterine cavity. Haemotrophe refers to nutrients from maternal blood exchange at the placenta.

3. Which feature best describes the teeth of an adult horse?

They are brachydont and stop erupting after eruption
They are hypsodont and continue erupting for much of life
They are designed mainly for tearing flesh
They lack a distinction between incisors and cheek teeth

They are hypsodont and continue erupting for much of life

Explication

Horse teeth are adapted for prolonged wear on abrasive forage, so they are hypsodont and erupt for a long period. The other options describe carnivorous or non-equine dental patterns.

4. Where does the thoracic duct usually terminate?

In the left jugular vein or cranial vena cava
In the right atrium through the coronary sinus
In the pulmonary trunk near the heart base
In the azygos vein before entering the mediastinum

In the left jugular vein or cranial vena cava

Explication

The thoracic duct usually terminates in the left jugular vein or the cranial vena cava. The other vessels are not its typical drainage endpoints.

5. Which statement best describes grey matter in the spinal cord?

It consists mainly of neuronal cell bodies and forms dorsal and ventral horns
It consists mainly of myelinated axon bundles arranged into cords
It contains cerebrospinal fluid in the central canal
It is found only in the cervical and lumbar enlargements

It consists mainly of neuronal cell bodies and forms dorsal and ventral horns

Explication

Grey matter is made up of neuronal cell bodies and is organized into dorsal and ventral horns. White matter is the part composed of myelinated axon bundles.

6. Which cloacal compartment receives the urinary outflow in birds?

Urodeum
Cecum
Coprodeum
Proctodeum

Urodeum

Explication

The urodeum is the middle cloacal compartment and receives the ureters and reproductive ducts. The coprodeum mainly receives digestive contents.

7. What is the key functional consequence of the bird renal portal system?

Air is stored for respiration during both inspiration and expiration
Blood from the gut reaches the liver before systemic circulation
Oxygen exchange occurs only in the air sacs
Blood from the posterior body can pass through kidney tissue before reaching the heart

Blood from the posterior body can pass through kidney tissue before reaching the heart

Explication

The renal portal system routes blood from the posterior body through the kidneys before it returns to the heart. This can affect drug distribution in the hindlimbs.

8. Which placental barrier type is characterized by complete reduction of the maternal placental barrier?

Epitheliochorial
Haemochorial
Synepitheliochorial
Endotheliochorial

Haemochorial

Explication

Haemochorial placentation shows near-complete reduction of the maternal barrier. Epitheliochorial placentation has the greatest remaining barrier, with maternal tissues largely preserved.

9. Where does fertilization mainly occur in domestic mammals?

In the vaginocervical junction after mating
Inside the ovarian follicle before ovulation
In the uterine body near the cervix
In the ampullary region of the oviduct

In the ampullary region of the oviduct

Explication

Fertilization mainly occurs in the ampullary region of the oviduct, where sperm contact the oocyte. The uterus and ovary are not the usual fertilization site.

10. Which statement best describes the origin of tongue musculature?

It arises only from neural crest cells
It develops from myoblasts that invade the tongue primordium
It develops entirely from pharyngeal endoderm
It forms from the first pharyngeal cleft

It develops from myoblasts that invade the tongue primordium

Explication

Tongue muscles develop from myoblasts that migrate into the tongue primordium, forming the skeletal musculature. The cleft contributes to ear canal formation, not the tongue.

11. Which sequence correctly traces the visual afferent pathway to the cortex?

Retina → olfactory bulb → thalamus → temporal cortex
Cornea → lens → optic nerve → cerebellum → occipital cortex
Retina → cranial nerve III → midbrain → parietal cortex
Retina → optic nerve → optic chiasm → optic tract → lateral geniculate nucleus → optic radiation → occipital cortex

Retina → optic nerve → optic chiasm → optic tract → lateral geniculate nucleus → optic radiation → occipital cortex

Explication

The visual afferent pathway runs from the retina through the optic nerve, chiasm, tract, lateral geniculate nucleus, and optic radiation to the occipital cortex. The other sequences mix in unrelated structures or incorrect nerve routes.

12. What does the first pharyngeal cleft develop into?

Palatine tonsil
Thyroid gland
External auditory meatus
Thymus

External auditory meatus

Explication

The first pharyngeal cleft becomes the external auditory meatus. The other structures arise from different embryologic regions.

13. What best describes the vocal cavity in relation to sound production?

It is the muscular canal that carries food to the stomach
It is the resonating space that helps modify voice sounds
It is the space where urine is temporarily stored
It is the bony chamber that houses the cochlea

It is the resonating space that helps modify voice sounds

Explication

The vocal cavity serves as a resonating space that shapes and amplifies sounds produced by the larynx. The other choices describe unrelated organs or functions.

14. What is the main function of the oval window in hearing?

It converts sound waves into neural impulses in the cochlea
It relieves pressure and transmits vibrations into cochlear fluid movement
It conducts sound from the auricle to the tympanic membrane
It equalizes pressure between the middle ear and the nasopharynx

It relieves pressure and transmits vibrations into cochlear fluid movement

Explication

The oval window releases inner-ear pressure and allows acoustic energy to drive cochlear fluid movement. Sound conversion into nerve signals occurs in the organ of Corti, not at the oval window.

15. Where is the avian pancreas located?

Inside the air sacs
Within the renal pelvis
Along the cranial mediastinum
Between the limbs of the duodenal loop

Between the limbs of the duodenal loop

Explication

In birds, the pancreas lies between the limbs of the duodenal loop. It is not located in the thorax or urinary system.

16. Which structure is part of the cranial mediastinum?

Heart apex
Diaphragmatic crus
Thoracic aorta
Cranial vena cava

Cranial vena cava

Explication

The cranial mediastinum includes the cranial vena cava, along with the esophagus and trachea. The thoracic aorta belongs more to the caudal mediastinum.

17. How do pancreatic ducts drain pancreatic juice in birds?

Through a single duct into the jejunum
Directly into the stomach
Through the bile duct into the liver
Through two or three ducts into the distal duodenum

Through two or three ducts into the distal duodenum

Explication

The avian pancreas typically uses two or three ducts that empty pancreatic juice into the distal duodenum. The other pathways are not correct for pancreatic drainage.

18. Which pair of papillae is classified as gustatory on the tongue?

Filiform and conical
Filiform and marginal
Conical and marginal
Fungiform and vallate

Fungiform and vallate

Explication

Fungiform and vallate papillae are gustatory papillae. Filiform papillae are mechanical and are the most numerous.

19. What is the main type of movement permitted by the equine temporomandibular joint?

Mainly hinge movement with limited lateral motion
No movement because it is a fused joint
Purely gliding movement without opening
Wide rotational movement in all directions

Mainly hinge movement with limited lateral motion

Explication

The horse temporomandibular joint functions primarily as a hinge joint, with only limited side-to-side motion. It is not a freely rotating or fused joint.

20. How is the lingual septum formed?

By growth of the mandibular prominence into the pharynx
By separation of the oral cavity into two chambers
By fusion of medial and lateral tongue swellings along the midline
By fusion of the pharyngeal arches on both sides

By fusion of medial and lateral tongue swellings along the midline

Explication

The lingual septum results from fusion of medial and lateral tongue swellings along the midline. This process helps shape the developing tongue.

21. Which structure is part of the larynx and helps close the airway during swallowing?

Nasopharynx
Azygos lobe
Tracheal rings
Epiglottis

Epiglottis

Explication

The epiglottis is a laryngeal structure that helps protect the airway during swallowing. The tracheal rings belong to the trachea, not the larynx.

22. Which statement about avian respiration is correct?

Air sacs are thick-walled organs that perform gas exchange directly
Birds lack a system that stores air outside the lungs
Fresh air enters the lungs only during expiration
Fresh air moves through the lungs during both inspiration and expiration

Fresh air moves through the lungs during both inspiration and expiration

Explication

Bird respiration is distinctive because airflow through the lungs continues during both inspiration and expiration. Air sacs are thin-walled flow-through structures that support this pattern.

23. Which cranial nerve is mixed and primarily innervates thoracic and abdominal viscera?

Accessory nerve (CN XI)
Olfactory nerve (CN I)
Vagus nerve (CN X)
Trochlear nerve (CN IV)

Vagus nerve (CN X)

Explication

The vagus nerve is a mixed cranial nerve and supplies thoracic and abdominal viscera. CN I is sensory, while CN XI is primarily motor.

24. What is the main consequence of cleavage during early embryonic development?

The embryo increases in cell number without cellular growth
The zygote immediately implants into the uterine lining
The embryo enlarges rapidly because each cell grows larger
The trophoblast forms before the first cell division

The embryo increases in cell number without cellular growth

Explication

Cleavage consists of repeated divisions without cellular growth, so the embryo increases in cell number first. Embryo enlargement and implantation happen later.

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Embryonic development — definition?

Process from fertilization to organ formation.

Embryonic period — focus?

Major organ systems are established.

Fertilization site — main location?

Ampullary region of the oviduct.

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