See Gesenius-Kautzsch §116s, or Joüon-Muraoka §154c regarding the omission of the pronominal subject from nominal clauses. See also the post on the Derived Stems found under the Hebrew 101 link for a reminder about the Pual.
For the Masoretic marginal notes, see Page Kelley’s The Masorah of Biblia Hebraica Stuttgartensia.
Be sure to watch the video on Nominal and Verbal Clauses under the Featured Topics on Syntax link in conjunction with this video.
Also see my post on the accents under the Hebrew 101 link.
For more reading on the noun שְׁכֶם “shoulder”, see Joüon-Muraoka §96Ak