MDS PREP
A tooth makes its appearance in the oral cavity usually when
1. all of the crown is completed
2. all of the root is completed
3. one half of the root is completed
4. one half of the crown is completed
Dental Anatomy
Answer: 3
A tooth makes its appearance in the oral cavity usually when one half of the root is completed
A mandibular primate space is usually found in the primary dentition between
1. first and second molars
2. central and lateral incisors
3. lateral incisor and canine
4. canine and first molar
Dental Anatomy
Answer: 4
A mandibular primate space is usually found in the primary dentition between canine and first molar
The muscle assisting in mastication but not supplied by mandibular nerve is
1.masseter 2.buccinator
3.mylohyoid 4.tensor veli palatine
Anatomy
Answer: 4
The muscle assisting in mastication but not supplied by mandibular nerve is tensor veli palatine
Temporalis muscle is inserted into:
1. lip and lateral surface of coronoid
2. Tip and medial surface of coronoid
3. Tip and anterior border of coronojd upto external oblique ridge
4. B and C
Anatomy
Answer: 2
Temporalis muscle is inserted into Tip and medial surface of coronoid
Which muscle of the soft palate is not supplied by the pharyngeal plexus?
1. Palatoglossus
2. Musculus uvulae
3. Palatopharyngeus
4. Tensor veli palatine
Anatomy
Answer: 4
muscle of the soft palate is not supplied by the pharyngeal plexus is Tensor veli palatine
The parasympathetic fibers to pterygopalatine ganglion come from
1. maxillary nerve
2. mandibular nerve
3. deep petrosal nerve
4. greater petrosal nerve
Anatomy
Answer: 4
The parasympathetic fibers to pterygopalatine ganglion come from greater petrosal nerve
The largest resting membrane potential is observed in
1. skeletal muscle
2. smooth muscle
3. equal in both
4. -120 mv in resting smooth muscle
Anatomy
Answer: 1
The largest resting membrane potential is observed in skeletal muscle.
Resting membrane potential (RMP) is the electrical potential difference across
the membrane of a cell when it is not undergoing an action potential or a
similar excitation. It is crucial for the functioning of excitable cells, such
as neurons and muscle cells, as it is the basis for the transmission of
electrical signals. The RMP is primarily determined by the concentration
gradients of ions across the cell membrane and the permeability of the membrane
to those ions.
In skeletal muscle cells, the resting membrane potential is typically around -90
millivolts (mV). This relatively high negative value is due to the higher
concentration of potassium ions (K+) inside the cell compared to the outside,
and the lower concentration of sodium ions (Na+) inside the cell compared to the
outside. The cell membrane is more permeable to K+ than to Na+ at rest, which
allows K+ to leak out through potassium channels and sets up the resting
membrane potential.
Smooth muscle cells, on the other hand, have a resting membrane potential that
is generally less negative than that of skeletal muscle cells. The typical RMP
in smooth muscle cells ranges from -40 to -70 mV, which is closer to the
threshold for depolarization and makes these cells more responsive to stimuli
that could cause contraction. The difference in RMP between smooth and skeletal
muscle is due to variations in ion channel expression and the activity of ion
pumps, which control the ionic composition of the intracellular and
extracellular environments.
To summarize:
1. Skeletal muscle cells have a resting membrane potential of approximately -90
mV.
2. Smooth muscle cells have a resting membrane potential that is generally more
positive than skeletal muscle cells, typically ranging from -40 to -70 mV.
The palatine bone articulates with all of the following except
1.sphenoid
2. ethmoid
3. zygomatic
4. vomer
Anatomy Answer: 2
The palatine bone articulates with all of the following except a.sphenoid b. ethmoid c. zygomatic d. maxilla