[ecgram]

A professor wanted to demonstrate the opening of naso-lacrimal duct in the nasal cavity to his students. For that he should look in to

1) middle meatus of lateral wall of nose
2) superior meatus of lateral wall of nose
3) inferior meatus of lateral wall of nose
4) nasal septum
5) roof of nasal cavity

 

[doctorF]

C-- inferior meatus for sure

 

[Kabutar111]

lacrimal in inferior
sensory fibre of smell in superior meatus or only above it.
right????

please correct if wrong:sorry:

 

[doctorF]

lacrimal in inferior
sensory fibre of smell in superior meatus or only above it.
right????

please correct if wrong:sorry:

sensory fibers of smell are in the nasal mucosa... they come from the cribriform plate... relay to olfactory bulb....

 

[Androide89]

dam is this in kaplan? i dont ever remember reading about this, what are in the middle/superior nasal conchae then?

 

[Kabutar111]

sensory fibers of smell are in the nasal mucosa... they come from the cribriform plate... relay to olfactory bulb....

its not in all nasal mucosa????, where below superior concha or above it???:notsure:

 

[doctorF]

dam is this in kaplan? i dont ever remember reading about this, what are in the middle/superior nasal conchae then?

contents of superior nasal concha include posterior ethmoidal sinus openings
contents of middle nasal concha include maxillary sinus opening, frontal sinus opening and anterior ethmoidal sinus openings

 

[doctorF]

its not in all nasal mucosa????, where below superior concha or above it???:notsure:

emmm...Olfactory receptor neurons are bipolar neurons with dendrites facing the interior space of the nasal cavity and an axon that passes through the cribiform plate then travels along the olfactory nerve to the olfactory bulb. The ORNs are located in the olfactory epithelium in the nasal cavity. The cell bodies of the ORNs are distributed among all three of the stratified layers of the olfactory epithelium.
Many tiny hair-like cilia protrude from the olfactory receptor cell's dendrite into the mucus covering the surface of the olfactory epithelium. The surface of these cilia is covered with olfactory receptors, a type of G protein-coupled receptor. Each olfactory receptor cell expresses only one type of olfactory receptor (OR), but many separate olfactory receptor cells express ORs which bind the same set of odors. The axons of olfactory receptor cells which bind the same odors converge to form glomeruli in the olfactory bulb.

 

[Seetal]

the answer is inf. meatus for sho!!

n remember, the olfactory neurons are the only neurons that regenerates itself from time to time.

 

[Seetal]

also, unless the professor was demostrating this on cadaver or a manikin, there is no way he could reach up the sup. meatus. )

 

[Androide89]

contents of superior nasal concha include posterior ethmoidal sinus openings
contents of middle nasal concha include maxillary sinus opening, frontal sinus opening and anterior ethmoidal sinus openings

is that all lateral nose wall?

 

[Seetal]

is that all lateral nose wall?

i think not the sup., but just the middle n inferior because the vomer stands in the medial of the nasi now.:notsure:

 

[ecgram]

@androide 89
i dont think its in kaplan i didnt see it in kaplan either

 

[doctorF]

is that all lateral nose wall?

yes its all in the lateral wall of the nose.... remember medial wall comprises of septal cartilage... and four bones behind it... vomer, sphenoid, palatine and fourth if i m not wrong mandibular bone... meatuses and conchas are in lateral wall....

 

[Seetal]

not mandibular dear.

yes its all in the lateral wall of the nose.... remember medial wall comprises of septal cartilage... and four bones behind it... vomer, sphenoid, palatine and fourth if i m not wrong mandibular bone... meatuses and conchas are in lateral wall....

not mandibular, but maxillary processes that extends to the post-inferior medial wall of cavum nasi.

 

[Seetal]

@androide 89
i dont think its in kaplan i didnt see it in kaplan either

do u have Netter's anatomy atlas? check his book. best illustrations with splendid colors.

 

[doctorF]

not mandibular, but maxillary processes that extends to the post-inferior medial wall of cavum nasi.

)) GODDD!! how could i make such a mistake.... obviously its maxillary process, happens at tymzzz

 

[Seetal]

)) GODDD!! how could i make such a mistake.... obviously its maxillary process, happens at tymzzz

happens a lot with all of us actually... we're only human.

 

[Kabutar111]

emmm...Olfactory receptor neurons are bipolar neurons with dendrites facing the interior space of the nasal cavity and an axon that passes through the cribiform plate then travels along the olfactory nerve to the olfactory bulb. The ORNs are located in the olfactory epithelium in the nasal cavity. The cell bodies of the ORNs are distributed among all three of the stratified layers of the olfactory epithelium.
Many tiny hair-like cilia protrude from the olfactory receptor cell's dendrite into the mucus covering the surface of the olfactory epithelium. The surface of these cilia is covered with olfactory receptors, a type of G protein-coupled receptor. Each olfactory receptor cell expresses only one type of olfactory receptor (OR), but many separate olfactory receptor cells express ORs which bind the same set of odors. The axons of olfactory receptor cells which bind the same odors converge to form glomeruli in the olfactory bulb.

but i read somewhere not remember now where:notsure: that olfactory nerve endings are locted only over and around superior nasal concha and rest of nasal cavity is lined by mucus epithelium, so does not take much part in olfactory sensation.
someone else know something about this???:toosad:

 

[Seetal]

but i read somewhere not remember now where:notsure: that olfactory nerve endings are locted only over and around superior nasal concha and rest of nasal cavity is lined by mucus epithelium, so does not take much part in olfactory sensation.
someone else know something about this???:toosad:

yes u are rite. DoctorF only described the olfactory epithelium n its function but did not mention where it lies.

so.. u're both rite!)