hello all this is dr alsup and thanks for joining me in another dissection video in this video we
will discuss some of the basics of the external genitalia of individuals assigned male at birth
so the two dominant structures without doing any deeper dissection are the penis and the scrotum
the scrotum which you can see kind of on either side here is composed of many layers but when
looking at an external view you see a cutaneous sac which will be suspended from the perineum
and the inferior portions of the proximal penis the scrotum contains the testes and the distal
portions of the spermatic cords and we will look at a deeper dissection in a moment of this
when looking at the external penis you see the body or the shaft of the penis as well as
the glans penis which is the expanded distal portion of the penis and here is the external
urethral meatus that's going to be located at the distal portion of the glans penis
in anatomical position the penis is actually in an erect state so this region here what we're viewing
is actually the dorsum or the dorsal portion of the penis as this is not in the erect state
all right let's look at a deeper dissection and focus on some of the contents of the
scrotum primarily the spermatic cords and the testes so the scrotum has been totally
dissected and we're only looking at the contents here you can see the testes here
and here as well as portions of the epididymis and almost the entirety of the epididymis right here
all right now the right spermatic cord has only been minimally dissected
and so you can see some of the fascial and muscular covering of the spermatic cord
namely the cremasteric fascia as well as the muscle so you can see that you can't
see any of these deeper structures because of the fascia and the cremasteric muscle
but looking at the left spermatic cord a deeper dissection has has occurred here and i often think
the dominant structure of the spermatic quarter at least the part that's easiest for me to identify
are the pampiniform plexus of veins so i'm just going to kind of outline some areas that are the
pampiniform plexus of veins you can see some of it here and some of it right around here so you see
it's a fairly dominant structure now we know that veins don't always present as blue in a dissection
but they actually often do for the pampiniform plexus additionally these veins tend to be a bit
more torturous than what we're used to for veins they're also going to surround the testicular
artery so this is the artery right here you can see it extending a little bit in this region
so that testicular artery recall is actually going to be a branch of the abdominal aorta
and extends all the way down to this region obviously to get towards the testes
the ductus or vas deferens is also a major component of the spermatic cord
and um you can see that it presents a bit more
rope-like or tube-like than the artery and the veins in this region
now in this dissection there's a bit more of a focus on the epididymis which you can see very
closely associated with the testis here you can actually see some of the efferent
ductules which we're not having you identify but that's going to help form the epididymis
the head of the epididymis is going to be more superiorly located so actually
closer to your head so that kind of helps in terms of being able to identify that
the body is going to be more intermediate and the tail of the epididymis is going to be more
inferiorly placed and this tail is going to be continuous with the ductus deferens or the vas
deferens which you can see if i continue on that vas or ductus deferens extending up to uh be part
of the spermatic cord and eventually make its way through the inguinal canal to get towards
um where it will join with the seminal gland to form the ejaculatory dot all right so that
should wrap us up with what you are responsible for identifying in a practical format as always
please feel free to reach out with any questions and thank you for your time and attention