"Wu Shaochen, tell me, how many bones are there in the head?"

"There are 23 skulls in the human body, including 8 brain skulls, including frontal bones, ethmoid bones, sphenoid bones, occipital bones, temporal bones, parietal bones, and parietal bones. There are 15 facial skulls, including maxillary bones, mandible bones, nasal bones, inferior turbinate bones, tear bones, zygomatic bones, hyoid bones, and plowing palatal bones."

Chen Xia clapped his hands: "Beautiful, with my style back then."

Hahaha~~~~

"I believe everyone knows where these bones are. Remember, I will talk about the common baselines for craniocerebral tomography. This is very important. Director Hua, please don't be stunned, take notes quickly."

Hahaha~~~~

I don’t know what stand-up comedy Chen Xia was performing in the conference room.

"The first baseline is called Reed's baseline, which is the line from the midpoint of the external auditory canal to the infraorbital edge. The production of transverse head fault specimens is mostly based on this line, and the production baseline of coronary fault specimens is perpendicular to this line.

The second baseline is called the orbital ear line or canthal ear line, which is the connection between the midpoint of the external auditory canal and the external canthus. The craniocerebral axial scan and transverse tomography mostly use this line as the baseline.

The third baseline is the upper orbital ear line, which is the connection between the midpoint of the external auditory canal and the midpoint of the upper orbital edge. The plane through this line is approximately consistent with the plane of the skull base, which is conducive to displaying the structure of the posterior cranial fossa and reducing skull artifacts."

Chen Xia said as he pointed it out to everyone one by one at the skull on his hand, and only the rustling sound of writing was left at the scene.

"We got a CT slice and read it correctly. Generally speaking, the CT slice of the head is axial position, that is, slices made in the up and down directions. Each image is 10mm thick, which means that the head tissue of the 10mm thick is displayed on an image.

The CT of the head is composed of multiple images. The first image is the lowest level, mostly connected to the external auditory canthus and the outer canthus of the eye. The last image is the top of the head, generally 11 layers. The general CT of the head is a soft tissue window, which mainly looks at the brain tissue.

We can see a circle with white outer layer. This is our skull, and the inside is gray. This is the brain tissue. There are some black parts in the brain tissue. This is the brain sulcus and cylindrical sulcus. Because it is cerebrospinal fluid inside, it shows black.

If the CT scan is taken by trauma, there will be a bone window under the soft tissue window. For example, in this picture, the bone window below mainly shows the skull. The bones are obviously white, and the brain tissue inside is not easy to observe and it is displayed as black."

Chen Xia took out a CT film and put it on the projector so that everyone could understand what he just said more intuitively and let everyone understand it well.

In fact, we just now felt like we were listening to the heavenly book. Although we kept memorizing, we couldn’t remember it any more. Now, as soon as the movie came out, we could see it clearly and truly.

Then, Chen Xia pointed to the corner of the CT film:

"The second step is that after getting the CT film, we need to learn to distinguish the front, back, left and right. The easiest way is to look at the information on the CT film. This information is generally in the upper left of each image, at this position.

Another important issue is left and right. Generally, the signs on the right side of "R" and the left side of "L" can be seen on both sides of each image, which represents the left and right. Through this sign, you can distinguish the left and right brain hemispheres on each image.

Everyone should remember this clearly. Although this problem seems to be very simple, there have been major medical mistakes in other hospitals.

For example, if the left kidney is clearly going to be operated, but the doctor misreads it and removes the healthy right kidney, then the patient will die and you will not be able to save your clothes. This is not a joke, it is a tragedy that has indeed happened abroad."

Hiss ~~~

Everyone took a breath of air conditioning, and it was completely imagined that the patient would fall into a desperate situation by mistake. Then, not only would the patient be killed, but he would definitely be fired.

If it is a brain surgery, the left and right ventricles are wrong, and the patient may die directly on the operating table.

When Chen Xia was frightened, everyone became more focused. Many people have always remembered Chen Laoshi's warning for many years and are absolutely careful when seeing a doctor.

After explaining some basic knowledge and anatomical pictures, some people have already started to yawn. Chen Xia said with a smile:

"It seems that everyone is already sleepy, so let's talk about the specific cases, so that everyone's impression will definitely be more profound."

Everyone will smile with heart.

Chen Xia put a CT on the projector:

"This is a CT scan of traumatic cerebral hemorrhage. If you look closely, you can see that the white part in the gray brain is cerebral hemorrhage. The most common ones are subdural hemorrhage and epidural hemorrhage. The simple difference between the two is that subdural hemorrhage is crescent-shaped, and epidural hemorrhage is biconvex-shaped.

Chen Xia pointed to a part on the film.

"Generally, after bleeding, there will be a displacement of the midline structure, and the lateral ventricle will be compressed and shifted, causing patients to increase in intracranial pressure to experience symptoms such as vomiting. Director Tan must have seen this for a lot. Next time, you will see this crescent-shaped and biconvex-shaped spindle shape, and you will know what the disease is."

Tan Zhigui nodded with a smile: "It would be even better if you could give me this CT film. I will definitely put it on the head of the bed every day. I will take a look at it in the morning and take a look before going to bed at night. I will definitely remember it."

Chen Xia pretended to shake: "Hey, I'm afraid that Master Ren will have nightmares when watching this head image every day. You won't let you go to bed then. Don't blame me for destroying your relationship with you couples."

Hahaha, everyone laughed again.

Chen Xia put another CT film on the projector, and everyone's eyes attracted the white screen again

"You can see this area at a glance now, right? Come on, guess what's going on."

Little Doctor A: "Is this intracranial hemorrhage?"

Doctor B: "Is this brain tissue liquefied?"

Ren Chenan: "Can this be a cerebral infarction?"

Chen Xia patted the table lightly: "Look, this is still the old man. Director Ren guessed it as soon as he guessed. Our young comrades should hurry up and study."

The little doctor A was muttering softly: "You are younger than me."

The little doctors next to him secretly covered their mouths and laughed.

"Cebral infarction can generally be divided into large-area cerebral infarction and lacunar cerebral infarction. Large-area cerebral infarction is a large dark gray area, and lacunar cerebral infarction is a dot-shaped dark gray area. The depth of its color is between normal brain tissue and black cerebrospinal fluid.

As time goes by, the infarction will liquefy, and the darker color will be close to the density of the ventricle. I believe that you have watched this film and you will be able to see what the problem is immediately after you get the patient's CT scan in the future, right?"
Chapter completed!