162
Davi d^(^)
Dr.^
by^
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Phot ography^
Cincinnati
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Lea r ni ng^
of^Ce ngage^University^Fankhauser,(^)
(C)
2016
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Figure 7- 18 (c) Scapula. (Continued)
The humerus (HYOO-mehr-us) is the largest and
longest bone of the upper arm (Figure 7-19). Its head is
rounded and joined to the rest of the bone by its anatomic
neck. The upper part of the bone has two
Chapter 7
prominences, the greater and lesser tubercles, which
function as insertions for many of the muscles of the up-per
extremity.
The ulna is the longer, medial bone of the forearm
(Figure 7-20). Its shaft is triangular, and the distal,- or
lower, end is called the head. At its proximal end is the
olecra-non (oh-LEK-rah-non) process or elbow. When
banged, nerves are pressed causing the tingling -sensation,
which gives it the common name of “funny bone.”
The radius is the shorter, lateral bone of the fore-arm.
It is joined to the ulna by an interosseus membrane
traversing- the area between the shafts of the two bones.
They move as one. The styloid process of the radius
articulates- with some of the bones of the wrist.
The bones of the wrist are called carpals (Figure 7-
21). They are arranged in two rows of four each. In the
proximal row from medial to lateral they are the pisiform-
(PYE-zih-form), triquetral (try-KWEE-tral),
Anatomic neck Head (^)
Greater tubercle Lesser
tubercle Anatomic (^)
(^) Surgical neck (^)
neck Surgical (^)
neck (^)
Intertubercular (^)
(bicipital) groove/sulcus (^)
Deltoid tuberosity
Lateral (^) Medial
supracondylar (^) supracondylar
ridge ridge (^)
Radial fossa Coronoidfossa
Lateral epicondyle Medial epicondyle (^)
Capitulum (^)
Trochlea (^)
(A)^ (B)^
Figure 7- 19 The right humerus. (A) Anterior view. (B) Posterior
view.
Radial groove
Olecranon fossa
Lateral epicondyle
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Learning Trochlea
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