MDS PREP
Which of the following muscles has two separate functions in mandibular
movement
1) Masseter
2) Geniohyoid
3) External(lateral)pterygoid
4) Buccinator
Anatomy Answer: 3
The external (lateral) pterygoid muscle has two primary functions: it assists in depressing the mandible (opening the mouth) and in moving the mandible forward (protrusion). This dual function distinguishes it from other muscles of mastication, which primarily elevate the mandible.
The medial pterygoid muscle is attached to the
1. lateral surface of lateral pterygoid plate
2. lateral surface of greater wing of sphenoid
3. medial surface of lateral pterygoid plate
4. medial surface of medial pterygoid plate
Anatomy
Answer: 3
The medial pterygoid muscle is attached to the medial surface of lateral pterygoid plate
Primary teeth begin to calcify between the ________ and ________months in
utero.
1) first; second
2) second; fourth
3) fourth; sixth
4) sixth; eighth
The primary teeth begin to form in utero at about six weeks. Hard tissue
formation occurs in all primary teeth by the 18th week in utero. 3. The
permanent teeth begin to develop at approximately four months of age in utero.
Maxillary and mandibular first molars begin to calcify at birth.
The muscle least related to pterygomandibular raphe is
1. superior pharyngeal constrictor
2.medial pterygoid
3. lateral pterygoid
4.buccinator
Anatomy
Answer: 3
The muscle least related to the pterygomandibular raphe is the lateral
pterygoid. The pterygomandibular raphe primarily connects the superior
pharyngeal constrictor and the buccinator muscles, while the medial and lateral
pterygoid muscles are involved in the movement of the jaw but do not have a
direct attachment to the raphe. Here’s a breakdown of the relationships:
Muscle Relationships to the Pterygomandibular Raphe
Superior Pharyngeal Constrictor:
Attaches to the posterior margin of the pterygomandibular raphe.
Plays a role in swallowing and constricting the pharynx.
Medial Pterygoid:
While not directly attached, it is located near the pterygomandibular
raphe and contributes to jaw movement.
Lateral Pterygoid:
Least related to the pterygomandibular raphe.
Primarily involved in moving the jaw forward and side to side, with
no direct attachment to the raphe.
Buccinator:
Attaches to the anterior margin of the pterygomandibular raphe.
Important for chewing and keeping food between the teeth.
If a 4th root canal is present in a maxillary 1st molar, it will likely be located in which of the following roots?
1) Mesiolingual
2) Mesiobuccal
3) Distolingual
4) Distofacial
Dental Anatomy Answer: 2
Well over 50% of maxillary 1st molars have two canals in the mesiobuccal root. Some authors cite the number as high as 90%.
There are usually 3 roots and 4 canals in a maxillary 1st molar.
The fourth canal, the mesiolingual canal, is also referred to as: the accessory mesiobuccal canal, mesiocentric, mesiopalatal canal or MB2.
It is usually tough to find MB2 through clinical inspection and it is not obvious on a radiograph. A dentist should expect it is present before beginning a root canal on the first maxillary molar.
A permanent tooth erupting in the mouth of an 11 years old child is most likely
1. maxillary lateral incisor
2. mandibular second bicuspid
3. maxillary third molar
4. rnandibular central incisor
Dental Anatomy
Answer: 2
A permanent tooth erupting in the mouth of an 11 years old child is most likely mandibular second bicuspid
Zygomaticotemporal nerve is a branch
1. Maxillary nerve
2. Facial nerve
3. Mandibular nerve
4. Nasociliary nerve
Anatomy
Answer: 1
Branches of Maxillary nerve are
1. Middle meningeal n.
2. zygomatic n. : zygomaticofacial, zygomaticotemporal
3.pterygopatine branches : orbital, post. sup. lat. nasal , medial septal, greater palatine, middle palatine , post. palatine
4. post. sup alveolar
5. Infraorbital
middle sup. alveolar
anterior sup. alveolar
6. Terminal
lat. nasal
inf. palpebral
sup. labialis
The smallest and most inaccessible root canal-in the maxillary second molar is the
1. faciolingual
2. mesiobuccal
3. lingual
4. distobuccal
Dental Anatomy
Answer: 4
The smallest and most inaccessible root canal-in the maxillary second molar is the distobuccal