Which of the following best describes the sagittal
plane?
Divides the body into anterior and posterior portions
Divides the body into superior and inferior portions
Divides the body into left and right portions
Divides the body into medial and lateral portions
Answer
Divides the body into left and right portions
The sagittal plane is a vertical plane that runs front to back,
splitting the body into left and right sections. The midsagittal
(median) plane creates equal halves, while parasagittal planes
create unequal left and right parts.
Rotator Cuff
Which rotator‑cuff muscle inserts on the anterior
aspect of the humerus?
Is the teres
minor}} muscle generally visible on the
surface?
Always visible
Usually hidden
Visible only when the arm is abducted and externally
rotated
Visible only after significant hypertrophy
Answer
Usually hidden
Teres minor is one of
the four rotator cuff
muscles. It sits deep beneath the deltoid and trapezius and is covered by
dense fascia along with infraspinatus. In most
individuals and most positions, it is not visible on the
surface.
Deltoid
Which of the following is the correct insertion point
of the deltoid
muscle?
Which triceps
head forms the lateral bulge when you extend your
arm?
Medial head
Anconeus
Lateral head
Long head
Answer
c
The lateral head of the triceps brachii is
what creates the obvious “bulge” on the outer (lateral) side of
your arm when you straighten (extend) your elbow.
Location & Origin
Arises from the posterior surface of the humerus, above the
radial groove, on the lateral aspect.
Why it bulges
Its fibers lie closest to the skin on the outside of the
arm, so when they contract—pulling the forearm straight—they
push outward against the overlying fascia.
In contrast
The long head runs more medially and
attaches to the scapula, so it contributes more to overall arm
mass and shoulder stability.
The medial head sits deepest, largely
covered by the other two heads.
The anconeus is a small accessory muscle at
the elbow, not visible as a bulge.
Thus, when you extend your arm, it’s the lateral head you see
most prominently on the outer curve of the triceps.
All three triceps
heads insert on which bony landmark?
Radial tuberosity
Coronoid process of the ulna
Medial epicondyle of the humerus
Olecranon of the ulna
Answerd
The long head of the triceps originates from which
scapular feature?
Supraglenoid tubercle
Infraglenoid tubercle
Coracoid process
Acromion
Answerb
The medial head of the triceps arises from which part
of the humerus?
Posterior shaft below the radial groove
Deltoid tuberosity
Lateral epicondyle
Intertubercular sulcus
Answera
The radial groove, used to trace the lateral head’s
form, runs along which bone?