Anatomic Science Quiz 4

Question 1 of 20

1. Question

PDL blood and nerve supply

(Oral Histology)

Which statement best describes the vascular and neural supply of the periodontal ligament (PDL)?

The PDL receives blood only from the gingival tissues

Correct Incorrect Correct answer

The PDL is supplied mainly by branches of the maxillary artery and innervated by branches of the trigeminal nerve

Correct Incorrect Correct answer

The PDL has no myelinated nerve fibers

Correct Incorrect Correct answer

The PDL contains only autonomic fibers with no sensory function

Correct Incorrect Correct answer

Question 2 of 20

2. Question

Lymph drainage – anterior floor of mouth

(Gross Anatomy / Lymphatics)

A squamous cell carcinoma arises in the midline of the anterior floor of the mouth. Which lymph nodes are most likely to be involved first?

Only right submandibular nodes

Correct Incorrect Correct answer

Only mediastinal nodes

Correct Incorrect Correct answer

Bilateral cervical/submandibular nodes

Correct Incorrect Correct answer

Retropharyngeal nodes

Correct Incorrect Correct answer

Question 3 of 20

3. Question

Teeth calcifying at birth

(Developmental Biology – Dental)

At the time of birth, which teeth are normally undergoing crown calcification?

Only all primary teeth

Correct Incorrect Correct answer

All primary teeth plus first permanent molars

Correct Incorrect Correct answer

All primary teeth and all permanent incisors

Correct Incorrect Correct answer

All primary and all permanent teeth

Correct Incorrect Correct answer

Question 4 of 20

4. Question

Primary vs permanent tooth morphology

(Oral Histology / Dental Morphology)

Which statement best compares primary molars with permanent molars?

Primary molars have a shorter root trunk than permanent molars

Correct Incorrect Correct answer

Primary molars have thinner, whiter-appearing enamel

Correct Incorrect Correct answer

Primary molar roots are more widely flared

Correct Incorrect Correct answer

All of the above

Correct Incorrect Correct answer

Question 5 of 20

5. Question

Hypoglossal nerve lesion

(Neuroanatomy – Cranial Nerves)

A patient has a right hypoglossal nerve paralysis. What is seen when the patient protrudes the tongue?

Tongue deviates to the left

Correct Incorrect Correct answer

Fasciculations only on the left side

Correct Incorrect Correct answer

Tongue deviates to the right

Correct Incorrect Correct answer

Tongue protrudes straight forward

Correct Incorrect Correct answer

Question 6 of 20

6. Question

Third molar displaced into submandibular space

(Gross Anatomy – Spaces of the Neck)

During extraction of a mandibular third molar, the tooth suddenly disappears lingually and is later found in the submandibular space. Which anatomic feature most explains this displacement?

A defect in the lingual cortical plate below the mylohyoid line

Correct Incorrect Correct answer

Root apices located above the mylohyoid muscle

Correct Incorrect Correct answer

Infection tracking above the mylohyoid into the sublingual space

Correct Incorrect Correct answer

Excessive buccal force used during extraction

Correct Incorrect Correct answer

Question 7 of 20

7. Question

Mandibular fracture – least common site

(Gross Anatomy – Mandible)

Which region of the mandible is least likely to experience a fracture?

Symphysis

Correct Incorrect Correct answer

Parasymphysis

Correct Incorrect Correct answer

Condyle

Correct Incorrect Correct answer

Coronoid process

Correct Incorrect Correct answer

Question 8 of 20

8. Question

Cranial base growth plate

(Developmental Biology – Cranial Base)

Which growth site is least influenced by orthodontic forces such as tension and compression?

Frontomaxillary suture

Correct Incorrect Correct answer

Alveolar bone of the maxilla

Correct Incorrect Correct answer

Nasomaxillary suture

Correct Incorrect Correct answer

Spheno-occipital synchondrosis

Correct Incorrect Correct answer

Question 9 of 20

9. Question

Muscles pulling fractured mandible backward

(Gross Anatomy – Suprahyoid Muscles)

After a bilateral fracture of the mandible in the canine region, which muscles tend to retract the anterior segment posteriorly?

Genioglossus and anterior belly of digastric

Correct Incorrect Correct answer

Genioglossus and masseter

Correct Incorrect Correct answer

Genioglossus and mylohyoid

Correct Incorrect Correct answer

Genioglossus and thyrohyoid

Correct Incorrect Correct answer

Question 10 of 20

10. Question

Molecular signal for tooth eruption

(Developmental Biology – Tooth Eruption)

Which signaling molecule is critical for normal tooth eruption, promoting bone resorption around the dental follicle?

Thyroxine-related protein

Correct Incorrect Correct answer

Melanin-related protein

Correct Incorrect Correct answer

Calcitonin-related peptide

Correct Incorrect Correct answer

Parathyroid hormone–related protein (PTHrP)

Correct Incorrect Correct answer

Question 11 of 20

11. Question

Foramen magnum contents

(Gross Anatomy – Skull Base)

Which structure normally passes through the foramen magnum?

Internal carotid artery

Correct Incorrect Correct answer

Sympathetic chain

Correct Incorrect Correct answer

Hypoglossal nerve (XII)

Correct Incorrect Correct answer

Vertebral arteries

Correct Incorrect Correct answer

Question 12 of 20

12. Question

Parotid gland – incorrect statement

(Gross Anatomy – Salivary Glands)

Which statement about the parotid gland is incorrect?

It is enclosed in a tough fascial capsule innervated by C2

Correct Incorrect Correct answer

It receives postganglionic parasympathetic fibers via the auriculotemporal nerve from the otic ganglion

Correct Incorrect Correct answer

It is composed predominantly of serous acini

Correct Incorrect Correct answer

It is covered by the masseter muscle

Correct Incorrect Correct answer

Question 13 of 20

13. Question

Facial nerve – combined features

(Neuroanatomy – Cranial Nerve VII)

Which statement best describes the facial nerve (CN VII)?

Its nucleus lies in the floor of the fourth ventricle

Correct Incorrect Correct answer

It emerges at the cerebellopontine angle on the brainstem

Correct Incorrect Correct answer

It carries taste from the anterior two-thirds of the tongue

Correct Incorrect Correct answer

All of the above

Correct Incorrect Correct answer

Question 14 of 20

14. Question

UMN lesion of facial nerve

(Neuroanatomy – Motor Pathways)

An upper motor neuron lesion affecting the facial nerve fibers (e.g., cortical stroke) most typically causes:

Weakness of the contralateral lower face with sparing of the forehead

Correct Incorrect Correct answer

Loss of gag reflex and posterior tongue taste

Correct Incorrect Correct answer

Complete ipsilateral facial paralysis of upper and lower face

Correct Incorrect Correct answer

Bilateral symmetric facial paralysis

Correct Incorrect Correct answer

Question 15 of 20

15. Question

Tensor tympani attachment

(Gross Anatomy – Middle Ear)

The tendon of the tensor tympani muscle attaches to which ossicle?

Incus

Correct Incorrect Correct answer

Malleus

Correct Incorrect Correct answer

Stapes

Correct Incorrect Correct answer

Hyoid bone

Correct Incorrect Correct answer

Question 16 of 20

16. Question

Oral epithelium type

(Oral Histology)

The lining mucosa of most of the oral cavity (e.g., inner cheek) is composed of:

Keratinized simple squamous epithelium

Correct Incorrect Correct answer

Keratinized stratified squamous epithelium

Correct Incorrect Correct answer

Non-keratinized simple squamous epithelium

Correct Incorrect Correct answer

Non-keratinized stratified squamous epithelium

Correct Incorrect Correct answer

Question 17 of 20

17. Question

Langerhans cells location

(Histology – Skin/Oral Mucosa)

Langerhans cells are most abundant in which layer of stratified squamous epithelium?

Stratum corneum

Correct Incorrect Correct answer

Stratum lucidum

Correct Incorrect Correct answer

Stratum granulosum

Correct Incorrect Correct answer

Stratum spinosum

Correct Incorrect Correct answer

Question 18 of 20

18. Question

Lymph drainage of mandibular incisors

(Gross Anatomy – Lymphatics)

Lymph from the mandibular incisors drains primarily into which nodes?

Submandibular nodes

Correct Incorrect Correct answer

Submental nodes

Correct Incorrect Correct answer

Superficial parotid nodes

Correct Incorrect Correct answer

Deep cervical nodes

Correct Incorrect Correct answer

Question 19 of 20

19. Question

Neuronal Na⁺ distribution

(Histology / Neurophysiology – High level)

Which neuronal region contains the highest intracellular Na⁺ concentration compared with other parts of the same neuron?

Dendrites

Correct Incorrect Correct answer

Cell body (soma)

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Synaptic terminals

Correct Incorrect Correct answer

None of these – Na⁺ is mainly higher outside the neuron than inside

Correct Incorrect Correct answer

Question 20 of 20

20. Question

Muscle spindle innervation

(Histology / Neuroanatomy – Muscle)

Which statement about muscle spindles is correct?

Muscle spindles are extrafusal fibers

Correct Incorrect Correct answer

They are innervated only by type Ia and III sensory fibers

Correct Incorrect Correct answer

They receive motor innervation from gamma motor neurons

Correct Incorrect Correct answer

They respond mainly to passive muscle tension rather than length

Correct Incorrect Correct answer

Anatomic Science Quiz 4

Quiz Summary

Information

Results

Results

Categories

1. Question

PDL blood and nerve supply

2. Question

Lymph drainage – anterior floor of mouth

3. Question

Teeth calcifying at birth

4. Question

Primary vs permanent tooth morphology

5. Question

Hypoglossal nerve lesion

6. Question

Third molar displaced into submandibular space

7. Question

Mandibular fracture – least common site

8. Question

Cranial base growth plate

9. Question

Muscles pulling fractured mandible backward

10. Question

Molecular signal for tooth eruption

11. Question

Foramen magnum contents

12. Question

Parotid gland – incorrect statement

13. Question

Facial nerve – combined features

14. Question

UMN lesion of facial nerve

15. Question

Tensor tympani attachment

16. Question

Oral epithelium type

17. Question

Langerhans cells location

18. Question

Lymph drainage of mandibular incisors

19. Question

Neuronal Na⁺ distribution

20. Question

Muscle spindle innervation